.mathbox-loader {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  padding: 10px;
  border-radius: 50%;
  background: #fff;
}

.mathbox-loader.mathbox-exit {
  opacity: 0;
  -webkit-transition: opacity 0.15s ease-in-out;
  transition: opacity 0.15s ease-in-out;
}

.mathbox-progress {
  height: 10px;
  border-radius: 5px;
  width: 80px;
  margin: 0 auto 20px;
  box-shadow: 1px 1px 1px rgba(255, 255, 255, 0.2),
    1px -1px 1px rgba(255, 255, 255, 0.2), -1px 1px 1px rgba(255, 255, 255, 0.2),
    -1px -1px 1px rgba(255, 255, 255, 0.2);
  background: #ccc;
  overflow: hidden;
}

.mathbox-progress > div {
  display: block;
  width: 0px;
  height: 10px;
  background: #888;
}

.mathbox-logo {
  position: relative;
  width: 140px;
  height: 100px;
  margin: 0 auto 10px;
  -webkit-perspective: 200px;
  perspective: 200px;
}

.mathbox-logo > div {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

.mathbox-logo > :nth-child(1) {
  -webkit-transform: rotateZ(22deg) rotateX(24deg) rotateY(30deg);
  transform: rotateZ(22deg) rotateX(24deg) rotateY(30deg);
}

.mathbox-logo > :nth-child(2) {
  -webkit-transform: rotateZ(11deg) rotateX(12deg) rotateY(15deg)
    scale3d(0.6, 0.6, 0.6);
  transform: rotateZ(11deg) rotateX(12deg) rotateY(15deg) scale3d(0.6, 0.6, 0.6);
}

.mathbox-logo > div > div {
  position: absolute;
  top: 50%;
  left: 50%;
  margin-left: -100px;
  margin-top: -100px;
  width: 200px;
  height: 200px;
  box-sizing: border-box;
  border-radius: 50%;
}

.mathbox-logo > div > :nth-child(1) {
  -webkit-transform: scale(0.5, 0.5);
  transform: rotateX(30deg) scale(0.5, 0.5);
}

.mathbox-logo > div > :nth-child(2) {
  -webkit-transform: rotateX(90deg) scale(0.42, 0.42);
  transform: rotateX(90deg) scale(0.42, 0.42);
}

.mathbox-logo > div > :nth-child(3) {
  -webkit-transform: rotateY(90deg) scale(0.35, 0.35);
  transform: rotateY(90deg) scale(0.35, 0.35);
}

.mathbox-logo > :nth-child(1) > :nth-child(1) {
  border: 16px solid #808080;
}
.mathbox-logo > :nth-child(1) > :nth-child(2) {
  border: 19px solid #a0a0a0;
}
.mathbox-logo > :nth-child(1) > :nth-child(3) {
  border: 23px solid #c0c0c0;
}
.mathbox-logo > :nth-child(2) > :nth-child(1) {
  border: 27px solid #808080;
}
.mathbox-logo > :nth-child(2) > :nth-child(2) {
  border: 32px solid #a0a0a0;
}
.mathbox-logo > :nth-child(2) > :nth-child(3) {
  border: 38px solid #c0c0c0;
}

.mathbox-splash-blue .mathbox-progress {
  background: #def;
}
.mathbox-splash-blue .mathbox-progress > div {
  background: #1979e7;
}
.mathbox-splash-blue .mathbox-logo > :nth-child(1) > :nth-child(1) {
  border-color: #1979e7;
}
.mathbox-splash-blue .mathbox-logo > :nth-child(1) > :nth-child(2) {
  border-color: #33b0ff;
}
.mathbox-splash-blue .mathbox-logo > :nth-child(1) > :nth-child(3) {
  border-color: #75eaff;
}
.mathbox-splash-blue .mathbox-logo > :nth-child(2) > :nth-child(1) {
  border-color: #18487f;
}
.mathbox-splash-blue .mathbox-logo > :nth-child(2) > :nth-child(2) {
  border-color: #33b0ff;
}
.mathbox-splash-blue .mathbox-logo > :nth-child(2) > :nth-child(3) {
  border-color: #75eaff;
}