.contents {
  position: relative;
  margin-top: 80vh;
}

.three-canvas {
  position: fixed;
  top: 80px;
  left: 0;
  margin: 0;
  width: 100vw;
  height: 100vh-80px;
  z-index: -1;
}

.topAbout-canvas {
  position: absolute;
  top: -200px;
}

.about-main {
  position: absolute;
  top: 0;
  width: 100vw;
  height: 80vh;
  left: 50%;
  transform: translateX(-50%);
}

@media screen and (max-width: 700px) {
  .three-canvas {
    margin: 32vh auto 0;
    width: 100vw;
    height: 80vh;
    transform: translateY(-50%);
  }
  .about-main {
    position: absolute;
    top: 20px;
    width: 100vw;
    height: calc((440/375)*100vw);
    left: 50%;
    transform: translateX(-50%);
  }
  .contents {
    margin-top: 80vh;
  }
}
.loader-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  overflow: hidden;
}
.loader,
.loader:after {
  border-radius: 50%;
  width: 5em;
  height: 5em;
}
.loader {
  margin: 50vh auto 0;
  transform: translateY(-50%);
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  border-top: 0.5em solid rgba(255, 255, 255, 0.2);
  border-right: 0.5em solid rgba(255, 255, 255, 0.2);
  border-bottom: 0.5em solid rgba(255, 255, 255, 0.2);
  border-left: 0.5em solid #2099f5;
  -webkit-transform: translateZ(0);
  -ms-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-animation: load8 1.1s infinite linear;
  animation: load8 1.1s infinite linear;
  overflow: hidden;
}
@-webkit-keyframes load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}