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HTML 

              
                <div class="loading-1"></div>
<div class="loading-2"></div>
<div class="loading-3"></div>
<div class="loading-4"></div>
<div class="loading-5"></div>
<div class="loading-6"></div>
<div class="loading-7"></div>
<div class="loading-8"></div>
<div class="loading-9"></div>
<div class="loading-10"></div>
<div class="loading-11"></div>
<div class="loading-12"></div>
<!--<div class="loading-13">LOADING</div>-->
<div class="loading-14"></div>
<div class="loading-15"></div>
<div class="loading-16"></div>
<div class="loading-17"></div>
!

CSS 

              
                :root {
  --primary: #666;
  --primary-rgba-0: rgba(102,102,102,0);
  --primary-rgba-1: rgba(102,102,102,1);
  --primary-rgba-61: rgba(102,102,102,1);
  --primary-rgba-62: rgba(102,102,102,0.8);
  --primary-rgba-63: rgba(102,102,102,0.6);
  --primary-rgba-64: rgba(102,102,102,0.4);
  --primary-rgba-65: rgba(102,102,102,0.2);
  --secondary: #ddd;
  --tertiary: #aaa;
  --background: #fff;
  --unit: 4rem;
  --width: var(--unit);
  --height: var(--unit);
}

[class^="loading-"] {
  position: relative;
  box-sizing: border-box;
  width: var(--width);
  height: var(--height);
  display: inline-flex;
  margin: 10px 20px;
}

/* Loading 1 */
@keyframes animation-1 {
  0% {
    transform: rotate(0deg)
  }
  100% {
    transform: rotate(360deg)
  }
}
.loading-1 {
  border-radius: 100%;
  background: linear-gradient(var(--primary), var(--secondary));
  animation: animation-1 2s linear infinite;
}
.loading-1:before {
  content: '';
  position: absolute;
  box-sizing: border-box;
  width: 80%;
  height: 80%;
  left: 10%;
  top: 10%;
  background: var(--background);
  border-radius: 100%;  
}

/* Loading 2 */
@keyframes animation-2 {
  0% {
    transform: rotate(0deg)
  } 
  50% {
    transform: rotate(180deg)
  }
  100% {
    transform: rotate(360deg)
  }
}
@keyframes animation-2b {
  0% {
    background-color: var(--primary);
  }
  50% {
    background-color: var(--secondary);
  }
  100% {
    background-color: var(--primary);
  }
}
@keyframes animation-2a {
  0% {
    background-color: var(--secondary);
  }
  50% {
    background-color: var(--primary);
  }
  100% {
    background-color: var(--secondary);
  }
}

.loading-2 {  
  animation: animation-2 2s ease-in-out infinite;
}
.loading-2:before {
  content: '';
  position: absolute;
  box-sizing: border-box;
  width: 25%;
  height: 25%;
  top: 10%;
  left: 50%;
  transform: translatex(-50%);
  background-color: var(--main);
  border-radius: 100%;
  animation: animation-2b 2s linear infinite;
}
.loading-2:after {
  content: '';
  position: absolute;
  box-sizing: border-box;
  width: 25%;
  height: 25%;
  bottom: 10%;
  left: 50%;
  transform: translatex(-50%);  
  background-color: var(--secondary);
  border-radius: 100%;
  animation: animation-2a 2s linear infinite;
}

/* Loading 3*/
@keyframes animation-3 {
  0% {
    width: 25%;
    height: 25%;
    background-color: var(--primary-rgba-1);
  }
  100% {
    width: 100%;
    height: 100%;
    background-color: var(--primary-rgba-0);
  }
}
.loading-3 {
  align-items: center;
  justify-content: center;
}
.loading-3:before {
  content: '';
  position: absolute;
  width: 25%;
  height: 25%;
  background-color: var(--primary-rgba-1);
  border-radius: 100%;
  animation: animation-3 1.5s ease-out infinite;
}

/* Loading 4*/
@keyframes animation-4 {
  0% {
    width: 25%;
    height: 25%;
    background-color: var(--primary-rgba-1);
  }
  100% {
    width: 100%;
    height: 100%;
    background-color: var(--primary-rgba-0);
  }
}
.loading-4 {
  align-items: center;
  justify-content: center;
}
.loading-4:before {
  content: '';
  position: absolute;
  width: 25%;
  height: 25%;
  background-color: var(--primary-rgba-1);
  border-radius: 100%;
  animation: animation-4 1.5s ease-out infinite;
}
.loading-4:after {
  content: '';
  position: absolute;
  width: 25%;
  height: 25%;
  background-color: var(--primary-rgba-1);
  border-radius: 100%;
  animation: animation-4 1.5s ease-out 0.75s infinite;
}

/* Loading 5 */
@keyframes animation-5 {
  0% {
    transform: rotatey(0deg);
  }
  100% {
    transform: rotate(90deg);
  }
}
@keyframes animation-5b {
  0% {
    width: 100%;
    height: 100%;
  }
  50% {
    width: 70%;
    height: 70%;
  }
  100% {
    width: 100%;
    height: 100%;
  }
}
@keyframes animation-5a {
  0% {
    width: 70%;
    height: 70%;
  }
  50% {
    width: 100%;
    height: 100%;
  }
  100% {
    width: 70%;
    height: 70%;
  }
}
.loading-5{
  align-items: center;
  justify-content: center;
  animation: animation-5 1.5s ease-in-out infinite;
 }
.loading-5:before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  border: 1px solid var(--primary);
  animation: animation-5b 3s ease-in-out infinite;
}
.loading-5:after {
  content: '';
  position: absolute;
  width: 70%;
  height: 70%;
  box-sizing: border-box;
  border: 1px solid var(--primary);
  transform: rotatez(45deg);
  animation: animation-5a 3s ease-in-out infinite;
}

/* Loading 6 */
@keyframes animation-6 {
  0% {
    background-color: var(--primary-rgba-61);
    box-shadow: calc(var(--width)/5) 0 var(--primary-rgba-62),
      calc((var(--width)/5) * 2 ) 0 var(--primary-rgba-63),
      calc((var(--width)/5) * 3 ) 0 var(--primary-rgba-64),
      calc((var(--width)/5) * 4 ) 0 var(--primary-rgba-65);
  }
  25% {
    background-color: var(--primary-rgba-62);
    box-shadow: calc(var(--width)/5) 0 var(--primary-rgba-61),
      calc((var(--width)/5) * 2 ) 0 var(--primary-rgba-62),
      calc((var(--width)/5) * 3 ) 0 var(--primary-rgba-63),
      calc((var(--width)/5) * 4 ) 0 var(--primary-rgba-64);
  }
  50% {
    background-color: var(--primary-rgba-63);
    box-shadow: calc(var(--width)/5) 0 var(--primary-rgba-62),
      calc((var(--width)/5) * 2 ) 0 var(--primary-rgba-61),
      calc((var(--width)/5) * 3 ) 0 var(--primary-rgba-62),
      calc((var(--width)/5) * 4 ) 0 var(--primary-rgba-63);
  }
  75% {
    background-color: var(--primary-rgba-64);
    box-shadow: calc(var(--width)/5) 0 var(--primary-rgba-63),
      calc((var(--width)/5) * 2 ) 0 var(--primary-rgba-62),
      calc((var(--width)/5) * 3 ) 0 var(--primary-rgba-61),
      calc((var(--width)/5) * 4 ) 0 var(--primary-rgba-62);
  }
  100% {
    background-color: var(--primary-rgba-65);
    box-shadow: calc(var(--width)/5) 0 var(--primary-rgba-64),
      calc((var(--width)/5) * 2 ) 0 var(--primary-rgba-63),
      calc((var(--width)/5) * 3 ) 0 var(--primary-rgba-62),
      calc((var(--width)/5) * 4 ) 0 var(--primary-rgba-61);
  }
}
.loading-6 {
  align-items: center;
}
.loading-6:before {
  content: '';
  position: absolute;
  width: 20%;
  height: 20%;
  border-radius: 100%;
  background-color: var(--primary-rgba-61);
  box-shadow: calc(var(--width)/5) 0 var(--primary-rgba-62),
    calc((var(--width)/5) * 2 ) 0 var(--primary-rgba-63),
    calc((var(--width)/5) * 3 ) 0 var(--primary-rgba-64),
    calc((var(--width)/5) * 4 ) 0 var(--primary-rgba-65);
  animation: animation-6 1.5s linear infinite alternate;
}

/* Loading 7 */
@keyframes animation-7 {
  0% {
    background-color: var(--primary-rgba-61);
    box-shadow: 0 0 0 0.15rem var(--primary-rgba-61),
    1rem 0 0 0 var(--primary-rgba-62),
    2rem 0 0 0 var(--primary-rgba-63),
    3rem 0 0 0 var(--primary-rgba-64);
  }
 33% {
    background-color: var(--primary-rgba-62);
    box-shadow: 0 0 0 0 var(--primary-rgba-62),
    1rem 0 0 0.15rem var(--primary-rgba-61),
    2rem 0 0 0 var(--primary-rgba-62),
    3rem 0 0 0 var(--primary-rgba-63);
  }
  66% {
    background-color: var(--primary-rgba-63);
    box-shadow: 0 0 0 0 var(--primary-rgba-63),
    1rem 0 0 0 var(--primary-rgba-62),
    2rem 0 0 0.15rem var(--primary-rgba-61),
    3rem 0 0 0 var(--primary-rgba-62);
  }
  100% {
    background-color: var(--primary-rgba-64);
    box-shadow: 0 0 0 0 var(--primary-rgba-64),
    1rem 0 0 0 var(--primary-rgba-63),
    2rem 0 0 0 var(--primary-rgba-62),
    3rem 0 0 0.15rem var(--primary-rgba-61);
  }
}
.loading-7 {
  align-items: center;
}
.loading-7:before {
  content: '';
  position: absolute;
  width: 20%;
  height: 20%;
  border-radius: 100%;
  background-color: var(--primary-rgba-61);
  box-shadow: 0 0 0 0.15rem var(--primary-rgba-61),
    1rem 0 var(--primary-rgba-62),
    2rem 0 var(--primary-rgba-63),
    3rem 0 var(--primary-rgba-64);
  animation: animation-7 1.5s linear infinite alternate;
}

/* Loading 8 */
@keyframes animation-8 {
  0% {
    width: 25%;
    height: 25%;
    background-color: var(--primary-rgba-1);
  }
  100% {
    width: 100%;
    height: 100%;
    background-color: var(--primary-rgba-0);
  }
}
.loading-8 {
  align-items: center;
  justify-content: center;
}
.loading-8:before {
  content: '';
  position: absolute;
  width: 25%;
  height: 25%;
  background-color: var(--primary-rgba-1);
  //border-radius: 100%;
  animation: animation-4 1.5s ease-out infinite;
}
.loading-8:after {
  content: '';
  position: absolute;
  width: 25%;
  height: 25%;
  background-color: var(--primary-rgba-1);
  border-radius: 100%;
  animation: animation-8 1.5s ease-out 0.75s infinite;
}

/* Loading 9 */
@keyframes animation-9 {
  0% {
    border-top-right-radius: 50%;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 50%;
    border-top-left-radius: 0;
  }
  25% {
    border-top-right-radius: 0;
    border-bottom-right-radius: 50%;
    border-bottom-left-radius: 0;
    border-top-left-radius: 50%;
  }
  50% {
    border-top-right-radius: 50%;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 50%;
    border-top-left-radius: 0;
  }  
  75% {
    border-top-right-radius: 0;
    border-bottom-right-radius: 50%;
    border-bottom-left-radius: 0;
    border-top-left-radius: 50%;
  }
  100% {
    border-top-right-radius: 50%;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 50%;
    border-top-left-radius: 0;
  }
}
.loading-9 {  
  justify-content: center;
  align-items: center;
  background-color: var(--secondary);
  border-top-right-radius: 50%;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 50%;
  border-top-left-radius: 0;
  animation: animation-9 2s linear infinite;
}
.loading-9:before {  
  content:'';
  position: absolute;
  width: 50%;
  height: 50%;
  background-color: var(--primary);
  border-top-right-radius: 50%;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 50%;
  border-top-left-radius: 0;
  animation: animation-9 2s linear 0.5s infinite;
}

/* Loading 10 */

@keyframes animation-10b {
  0% {
    left: 0;
  }
  100% {
    left: 90%;
  }
}
@keyframes animation-10a {
  0% {    
    box-shadow: -1.5rem 0 var(--primary), 1.5rem 0 var(--secondary);
  }
  100% {
    box-shadow: -1.5rem 0 var(--secondary), 1.5rem 0 var(--primary);
  }
}
.loading-10 {
  justify-content: center;
  align-items: center;
  overflow: hidden;
}
.loading-10:before {
  content: '';
  position: absolute;
  width: 10%;
  height: 10%;
  background-color: var(--primary);
  border-radius: 100%;
  left: 0;
  animation: animation-10b 1.2s cubic-bezier(0.88, 0.16, 0.16, 0.88) infinite alternate;
}
.loading-10:after {  
  content: '';
  position: absolute;
  width: 25%;
  height: 25%;
  background-color: transparent;
  border-radius: 100%;
  box-shadow: -1.5rem 0 var(--primary), 1.5rem 0 var(--secondary);
  animation: animation-10a 1.2s cubic-bezier(0.88, 0.16, 0.16, 0.88) infinite alternate;
}

/* Loading 11 */
@keyframes animation-11 {
  0% {
    transform: rotate(0);
  }
  100% {
    transform: rotate(360deg);
  }
}
.loading-11:before {
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  border-radius: 100%;
  border-top: calc(var(--unit)/2) solid var(--primary);
  border-right: calc(var(--unit)/2) solid var(--secondary);
  border-bottom: calc(var(--unit)/2) solid var(--primary);
  border-left: calc(var(--unit)/2) solid var(--secondary);
  animation: animation-11 2s linear infinite;
}

/* Loading 12*/
@keyframes animation-12b {
  0% {
    transform: rotatey(0);
  }
  100% {
    transform: rotatey(360deg);
  }
}
@keyframes animation-12a {
  0% {
    transform: rotatey(0);
  }
  100% {
    transform: rotatey(-360deg);
  }
}
.loading-12{
  align-items: center;
  justify-content: center;
 }
.loading-12:before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  border: 2px solid var(--primary);
  border-radius: 100%;
  animation: animation-12b 3s linear infinite;
}
.loading-12:after {
  content: '';
  position: absolute;
  width: 50%;
  height: 50%;
  box-sizing: border-box;
  border: 2px solid var(--primary);
  border-radius: 100%;
  animation: animation-12a 1.5s linear infinite reverse;
}

/* Loading 13*/
.loading-13 {
  width: calc(var(--width)*2);
  height: calc(var(--height)/2);
  background-image: linear-gradient( var(--primary) 20%, var(--secondary) 40%, var(--primary) 60%, var(--secondary) 80%);
  background-repeat: repeat;
  background-position: 0 0;
  background-size: 100% calc(var(--height)/2);
  -webkit-text-fill-color: transparent;
  -webkit-background-clip: text;
  animation: animation-13 1s linear infinite;
  font: 1.5em Arial;
  font-weight: bold;
}
@keyframes animation-13 {
  100% {
    background-position: 0 var(--height);
  }
}

/* Loading 14 */
@keyframes animation-14 {
  0% {
    transform: rotate(0deg)
  }
  100% {
    transform: rotate(360deg)
  }
}
.loading-14 {
  border-radius: 100%;
  background: conic-gradient(#fff,#000);
  animation: animation-1 2s linear infinite;
}
.loading-14:before {
  content: '';
  position: absolute;
  box-sizing: border-box;
  width: 80%;
  height: 80%;
  left: 10%;
  top: 10%;
  background: var(--background);
  border-radius: 100%;  
}

/* Loading 15 */
@keyframes animation-15 {
  0% {
    transform: rotate(0deg)
  }
  100% {
    transform: rotate(360deg)
  }
}
.loading-15 {
  border-radius: 100%;
  background: conic-gradient(#fff,#000);
  animation: animation-1 2s linear infinite;
}
.loading-15:before {
  content: '';
  position: absolute;
  box-sizing: border-box;
  width: 80%;
  height: 80%;
  left: 10%;
  top: 10%;
  background: conic-gradient(#000,#fff);
  border-radius: 100%;  
  animation: animation-1 4s linear infinite;
}
.loading-15:after {
  content: '';
  position: absolute;
  box-sizing: border-box;
  width: 60%;
  height: 60%;
  left: 20%;
  top: 20%;
  background: var(--background);
  border-radius: 100%;  
}

/* Loading 16 */
@keyframes animation-16 {
  0% {
    transform: rotate(0);
  }
  100% {
    transform: rotate(360deg);
  }
}
.loading-16:before {
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  border-radius: 100%;
  border-top: calc(var(--unit)/2) solid var(--primary);
  border-right: calc(var(--unit)/2) solid var(--secondary);
  border-bottom: calc(var(--unit)/2) solid var(--primary);
  border-left: calc(var(--unit)/2) solid var(--secondary);
  animation: animation-16 2s linear infinite;
}
.loading-16:after {
  content: '';
  position: absolute;
  box-sizing: border-box;
  width: 80%;
  height: 80%;
  left:10%;
  top: 10%;
  background: var(--background);
  border-radius: 100%;  
}





/* Loading 8 */
@keyframes animation-17 {
  0% {
    width: 25%;
    height: 25%;
    background-color: var(--primary-rgba-1);
  }
  100% {
    width: 100%;
    height: 100%;
    background-color: var(--primary-rgba-0);
  }
}
.loading-17 {
  align-items: center;
  justify-content: center;
  //background-color: var(--primary-rgba-1);
  //animation: animation-17 1.5s ease-out 0.75s infinite;
}
.loading-17:before {
  content: '';
  position: absolute;
  width: 25%;
  height: 25%;
  background-color: var(--primary-rgba-1);
  clip-path: polygon( 50% 0%, 90% 90%, 0% 90%);
  animation: animation-4 1.5s ease-out infinite;
}
.loading-17:after {
  content: '';
  position: absolute;
  width: 25%;
  height: 25%;
  background-color: var(--primary-rgba-1);
  border-radius: 50%;
  animation: animation-8 1.5s ease-out 0.75s infinite;
}
!

JS 

              
                /*
loading-14 & loading-15 are using Lea Verou's Conic Gradient Polyfill
https://leaverou.github.io/conic-gradient/
*/
!
999px

Console