.loader {
  border: 10px solid #f3f3f3;
  border-radius: 50%;
  border-top: 10px solid black;
  border-right: 10px solid #dcdcdc;
  border-bottom: 10px solid black;
  border-left: 10px solid #dcdcdc;
  width: 100px;
  height: 100px;
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;
  margin: 0 auto;
}
.loader_small {
  border: 4px solid #f3f3f3;
  border-radius: 50%;
  border-top: 4px solid black;
  border-right: 4px solid #dcdcdc;
  border-bottom: 4px solid black;
  border-left: 4px solid #dcdcdc;
  width: 50px;
  height: 50px;
  -webkit-animation: spin 1s linear infinite;
  animation: spin 1s linear infinite;
  margin: 0 auto;
  
}

@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* loader 2
<div class="lds-hourglass"></div>
 */
 
 .lds-hourglass {
  display: inline-block;
  position: relative;
  width: 80px;
  height: 80px;
}
.lds-hourglass:after {
  content: " ";
  display: block;
  border-radius: 50%;
  width: 0;
  height: 0;
  margin: 8px;
  box-sizing: border-box;
  border: 32px solid #007bff;
  border-color: #007bff transparent #007bff transparent;
  animation: lds-hourglass 1.2s infinite;
}
@keyframes lds-hourglass {
  0% {
    transform: rotate(0);
    animation-timing-function: cubic-bezier(0.55, 0.055, 0.675, 0.19);
  }
  50% {
    transform: rotate(900deg);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }
  100% {
    transform: rotate(1800deg);
  }
}

/* loader 3 
<div class="lds-ripple"><div></div><div></div></div>
*/

.lds-ripple {
  display: inline-block;
  position: relative;
  width: 80px;
  height: 80px;
}
.lds-ripple div {
  position: absolute;
  border: 4px solid #fff;
  opacity: 1;
  border-radius: 50%;
  animation: lds-ripple 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}
.lds-ripple div:nth-child(2) {
  animation-delay: -0.5s;
}
@keyframes lds-ripple {
  0% {
    top: 36px;
    left: 36px;
    width: 0;
    height: 0;
    opacity: 1;
  }
  100% {
    top: 0px;
    left: 0px;
    width: 72px;
    height: 72px;
    opacity: 0;
  }
}

/* loader 4
<div class="lds-ring"><div></div><div></div><div></div><div></div></div>
 */
 
 .lds-ring {
  display: inline-block;
  position: relative;
  width: 80px;
  height: 80px;
}
.lds-ring div {
  box-sizing: border-box;
  display: block;
  position: absolute;
  width: 64px;
  height: 64px;
  margin: 8px;
  border: 8px solid #fff;
  border-radius: 50%;
  animation: lds-ring 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
  border-color: #fff transparent transparent transparent;
}
.lds-ring div:nth-child(1) {
  animation-delay: -0.45s;
}
.lds-ring div:nth-child(2) {
  animation-delay: -0.3s;
}
.lds-ring div:nth-child(3) {
  animation-delay: -0.15s;
}
@keyframes lds-ring {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}