@keyframes rotate2 {
  0% {
    transform: rotate(0deg);
    border-top-color: rgba(0, 0, 0, 0.5);
  }
  50% {
    transform: rotate(180deg);
    border-top-color: rgba(0, 0, 255, 0.5);
  }
  100% {
    transform: rotate(360deg);
    border-top-color: rgba(0, 0, 0, 0.5);
  }
}

.spinning * {
  box-sizing: border-box;
}

.spinning h1 {
  display: block;
  margin: 50px auto;
  text-align: center;
  font-family: "Tahoma";
  font-weight: lighter;
  color: rgba(0, 0, 0, 0.5);
  letter-spacing: 1.5px;
}

.loader {
  position: relative;
  margin: 75px auto;
  width: 150px;
  height: 150px;
  display: block;
  overflow: hidden;
}

.loader div {
  height: 100%;
}

/* loader 4 */
.loader4, .loader4 div {
  border: 2px solid transparent;
  border-radius: 50%;
  padding: 4px;
  animation: rotate2 4s infinite linear;
}

.spinning div:hover {
  animation-play-state: paused;
}

.loader, .loader * {
  will-change: transform;
}