Hi All,

Below is some example of pure css loader. Using css animation. All are single element loader.

Please, check the below code for details.

section{
  margin: 10px 0;
}
.loader {
  position: absolute;
  z-index: 1;
  left: 0;
  right: 0;
  margin: 0 auto; 
}


.loader-1 {
  height: 100px;
}
.loader-1 .loader {
  width: 100px;
  height: 100px;
  background-color: #03445d;
  -webkit-border-radius: 100%;
  -moz-border-radius: 100%;
  -ms-border-radius: 100%;
  -o-border-radius: 100%;
  border-radius: 100%;
}
.loader-1 .loader:before {
  display: block;
  position: absolute;
  z-index: 2;
  left: 0;
  right: 0;
  top: 10px;
  margin: 0 auto;
  width: 20px;
  height: 20px;
  background-color: #7c7803;
  content: "";
  -webkit-border-radius: 20px;
  -moz-border-radius: 20px;
  -ms-border-radius: 20px;
  -o-border-radius: 20px;
  border-radius: 20px;
  -webkit-transform-origin: 10px 40px;
  -moz-transform-origin: 10px 40px;
  -ms-transform-origin: 10px 40px;
  -o-transform-origin: 10px 40px;
  transform-origin: 10px 40px;
  -webkit-animation: loader-1 1s infinite linear;
  -moz-animation: loader-1 1s infinite linear;
  -ms-animation: loader-1 1s infinite linear;
  -o-animation: loader-1 1s infinite linear;
  animation: loader-1 1s infinite linear;
}

@-webkit-keyframes loader-1 {
  from {
    -webkit-transform: rotate(0deg);
  }

  to {
    -webkit-transform: rotate(360deg);
  }
}

@-moz-keyframes loader-1 {
  from {
    -moz-transform: rotate(0deg);
  }

  to {
    -moz-transform: rotate(360deg);
  }
}

@-ms-keyframes loader-1 {
  from {
    -ms-transform: rotate(0deg);
  }

  to {
    -ms-transform: rotate(360deg);
  }
}

@-o-keyframes loader-1 {
  from {
    -o-transform: rotate(0deg);
  }

  to {
    -o-transform: rotate(360deg);
  }
}

@keyframes loader-1 {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

/* ============================================================
  loader 2
============================================================ */
.loader-2 {
  height: 100px;
}
.loader-2 .loader {
  width: 100px;
  height: 100px;
}
.loader-2 .loader:before {
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  border-top: solid 20px #7c7803;
  border-bottom: solid 20px #7c7803;
  border-left: solid 20px transparent;
  border-right: solid 20px transparent;
  content: "";
  -webkit-border-radius: 50px;
  -moz-border-radius: 50px;
  -ms-border-radius: 50px;
  -o-border-radius: 50px;
  border-radius: 50px;
  -webkit-animation: loader-2 1s infinite ease;
  -moz-animation: loader-2 1s infinite ease;
  -ms-animation: loader-2 1s infinite ease;
  -o-animation: loader-2 1s infinite ease;
  animation: loader-2 1s infinite ease;
}
.loader-2 .loader:after {
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  margin: auto;
  width: 40px;
  height: 40px;
  background-color: #03445d;
  content: "";
  -webkit-border-radius: 20px;
  -moz-border-radius: 20px;
  -ms-border-radius: 20px;
  -o-border-radius: 20px;
  border-radius: 20px;
}

@-webkit-keyframes loader-2 {
  from {
    -webkit-transform: rotate(0deg);
  }

  to {
    -webkit-transform: rotate(360deg);
  }
}

@-moz-keyframes loader-2 {
  from {
    -moz-transform: rotate(0deg);
  }

  to {
    -moz-transform: rotate(360deg);
  }
}

@-ms-keyframes loader-2 {
  from {
    -ms-transform: rotate(0deg);
  }

  to {
    -ms-transform: rotate(360deg);
  }
}

@-o-keyframes loader-2 {
  from {
    -o-transform: rotate(0deg);
  }

  to {
    -o-transform: rotate(360deg);
  }
}

@keyframes loader-2 {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

/* ============================================================
  loader 3
============================================================ */
.loader-3 {
  height: 100px;
}
.loader-3 .loader {
  width: 100px;
  height: 100px;
}
.loader-3 .loader:before, .loader-3 .loader:after {
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto 0;
  width: 40px;
  height: 40px;
  content: "";
  -webkit-border-radius: 20px;
  -moz-border-radius: 20px;
  -ms-border-radius: 20px;
  -o-border-radius: 20px;
  border-radius: 20px;
}
.loader-3 .loader:before {
  left: 0;
  background-color: #03445d;
  -webkit-animation: loader-3-left 1s infinite linear;
  -moz-animation: loader-3-left 1s infinite linear;
  -ms-animation: loader-3-left 1s infinite linear;
  -o-animation: loader-3-left 1s infinite linear;
  animation: loader-3-left 1s infinite linear;
}
.loader-3 .loader:after {
  right: 0;
  background-color: #7c7803;
  -webkit-animation: loader-3-right 1s infinite linear;
  -moz-animation: loader-3-right 1s infinite linear;
  -ms-animation: loader-3-right 1s infinite linear;
  -o-animation: loader-3-right 1s infinite linear;
  animation: loader-3-right 1s infinite linear;
}

/* left ball */
@-webkit-keyframes loader-3-left {
  0% {
    -webkit-transform: translate(0, 0);
  }

  25% {
    -webkit-transform: translate(30px, 0);
  }

  50% {
    -webkit-transform: translate(30px, -30px);
  }

  75% {
    -webkit-transform: translate(30px, 0);
  }

  100% {
    -webkit-transform: translate(0, 0);
  }
}

@-mos-keyframes loader-3-left {
  0% {
    -mos-transform: translate(0, 0);
  }

  25% {
    -mos-transform: translate(30px, 0);
  }

  50% {
    -mos-transform: translate(30px, -30px);
  }

  75% {
    -mos-transform: translate(30px, 0);
  }

  100% {
    -mos-transform: translate(0, 0);
  }
}

@-ms-keyframes loader-3-left {
  0% {
    -ms-transform: translate(0, 0);
  }

  25% {
    -ms-transform: translate(30px, 0);
  }

  50% {
    -ms-transform: translate(30px, -30px);
  }

  75% {
    -ms-transform: translate(30px, 0);
  }

  100% {
    -ms-transform: translate(0, 0);
  }
}

@-o-keyframes loader-3-left {
  0% {
    -o-transform: translate(0, 0);
  }

  25% {
    -o-transform: translate(30px, 0);
  }

  50% {
    -o-transform: translate(30px, -30px);
  }

  75% {
    -o-transform: translate(30px, 0);
  }

  100% {
    -o-transform: translate(0, 0);
  }
}

@keyframes loader-3-left {
  0% {
    transform: translate(0, 0);
  }

  25% {
    transform: translate(30px, 0);
  }

  50% {
    transform: translate(30px, -30px);
  }

  75% {
    transform: translate(30px, 0);
  }

  100% {
    transform: translate(0, 0);
  }
}

/* right ball */
@-webkit-keyframes loader-3-right {
  0% {
    -webkit-transform: translate(0, 0);
  }

  25% {
    -webkit-transform: translate(-30px, 0);
  }

  50% {
    -webkit-transform: translate(-30px, 30px);
  }

  75% {
    -webkit-transform: translate(-30px, 0);
  }

  100% {
    -webkit-transform: translate(0, 0);
  }
}

@-moz-keyframes loader-3-right {
  0% {
    -moz-transform: translate(0, 0);
  }

  25% {
    -moz-transform: translate(-30px, 0);
  }

  50% {
    -moz-transform: translate(-30px, 30px);
  }

  75% {
    -moz-transform: translate(-30px, 0);
  }

  100% {
    -moz-transform: translate(0, 0);
  }
}

@-ms-keyframes loader-3-right {
  0% {
    -ms-transform: translate(0, 0);
  }

  25% {
    -ms-transform: translate(-30px, 0);
  }

  50% {
    -ms-transform: translate(-30px, 30px);
  }

  75% {
    -ms-transform: translate(-30px, 0);
  }

  100% {
    -ms-transform: translate(0, 0);
  }
}

@-o-keyframes loader-3-right {
  0% {
    -o-transform: translate(0, 0);
  }

  25% {
    -o-transform: translate(-30px, 0);
  }

  50% {
    -o-transform: translate(-30px, 30px);
  }

  75% {
    -o-transform: translate(-30px, 0);
  }

  100% {
    -o-transform: translate(0, 0);
  }
}

@keyframes loader-3-right {
  0% {
    transform: translate(0, 0);
  }

  25% {
    transform: translate(-30px, 0);
  }

  50% {
    transform: translate(-30px, 30px);
  }

  75% {
    transform: translate(-30px, 0);
  }

  100% {
    transform: translate(0, 0);
  }
}

/* ============================================================
  loader 4
============================================================ */
.loader-4 {
  height: 100px;
}
.loader-4 .loader {
  width: 100px;
  height: 100px;
}
.loader-4 .loader:before, .loader-4 .loader:after {
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto 0;
  width: 50px;
  height: 50px;
  content: "";
  -webkit-border-radius: 25px;
  -moz-border-radius: 25px;
  -ms-border-radius: 25px;
  -o-border-radius: 25px;
  border-radius: 25px;
}
.loader-4 .loader:before {
  left: 0;
  background-color: #03445d;
  -webkit-animation: loader-4-left 0.5s infinite ease;
  -moz-animation: loader-4-left 0.5s infinite ease;
  -ms-animation: loader-4-left 0.5s infinite ease;
  -o-animation: loader-4-left 0.5s infinite ease;
  animation: loader-4-left 0.5s infinite ease;
}
.loader-4 .loader:after {
  right: 0;
  background-color: #7c7803;
  -webkit-animation: loader-4-right 0.5s infinite ease;
  -moz-animation: loader-4-right 0.5s infinite ease;
  -ms-animation: loader-4-right 0.5s infinite ease;
  -o-animation: loader-4-right 0.5s infinite ease;
  animation: loader-4-right 0.5s infinite ease;
}

/* left ball */
@-webkit-keyframes loader-4-left {
  0% {
    -webkit-transform: scale(0.5);
  }

  50% {
    -webkit-transform: scale(1);
  }

  100% {
    -webkit-transform: scale(0.5);
  }
}

@-moz-keyframes loader-4-left {
  0% {
    -moz-transform: scale(0.5);
  }

  50% {
    -moz-transform: scale(1);
  }

  100% {
    -moz-transform: scale(0.5);
  }
}

@-ms-keyframes loader-4-left {
  0% {
    -ms-transform: scale(0.5);
  }

  50% {
    -ms-transform: scale(1);
  }

  100% {
    -ms-transform: scale(0.5);
  }
}

@-o-keyframes loader-4-left {
  0% {
    -o-transform: scale(0.5);
  }

  50% {
    -o-transform: scale(1);
  }

  100% {
    -o-transform: scale(0.5);
  }
}

@keyframes loader-4-left {
  0% {
    transform: scale(0.5);
  }

  50% {
    transform: scale(1);
  }

  100% {
    transform: scale(0.5);
  }
}

/* right ball */
@-webkit-keyframes loader-4-right {
  0% {
    -webkit-transform: scale(1);
  }

  50% {
    -webkit-transform: scale(0.5);
  }

  100% {
    -webkit-transform: scale(1);
  }
}

@-moz-keyframes loader-4-right {
  0% {
    -moz-transform: scale(1);
  }

  50% {
    -moz-transform: scale(0.5);
  }

  100% {
    -moz-transform: scale(1);
  }
}

@-ms-keyframes loader-4-right {
  0% {
    -ms-transform: scale(1);
  }

  50% {
    -ms-transform: scale(0.5);
  }

  100% {
    -ms-transform: scale(1);
  }
}

@-o-keyframes loader-4-right {
  0% {
    -o-transform: scale(1);
  }

  50% {
    -o-transform: scale(0.5);
  }

  100% {
    -o-transform: scale(1);
  }
}

@keyframes loader-4-right {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(0.5);
  }

  100% {
    transform: scale(1);
  }
}

Output-