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

.wrap-loading {
  background: #333;
  width: 100%;
  height: 100%;
  position: relative;
}

.loading {
  border-radius: 50%;
  top: 50%;
  left: 50%;
  animation: spin 750ms infinite linear;
  -webkit-animation: spin 750ms infinite linear;
  -moz-animation: spin 750ms infinite linear;
  -o-animation: spin 750ms infinite linear;
  -ms-animation: spin 750ms infinite linear;
}
.loading-1 {
  width: 24px;
  height: 24px;
  border: 2px solid #ebebeb;
  border-top-color: transparent;
}
.loading-2 {
  margin-top: -20px;
  margin-left: -20px;
  width: 40px;
  height: 40px;
  border: 3px solid #ebebeb;
  border-top-color: transparent;
}
.loading-3 {
  margin-top: -25px;
  margin-left: -25px;
  width: 50px;
  height: 50px;
  border: 3px solid #ebebeb;
  border-top-color: transparent;
}
.loading-4 {
  margin-top: -35px;
  margin-left: -35px;
  width: 70px;
  height: 70px;
  border: 4px solid #ebebeb;
  border-top-color: transparent;
}