.page-container {
  left: 0;
  right: 0;
  margin: auto;
  margin-top: 20px;
  padding-left: 280px;
  display: inline-flex !important;
}

video1{
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);    /* Safari 和 Chrome */
     -moz-transform: rotateY(180deg);
}
#navbar {
  position: absolute;
  top: 20px;
  left: 20px;
}
body,html{
    margin: 0 auto;
    height: 100%;
    width: 100%;
}
.center-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.side-by-side {
  display: flex;
  justify-content: center;
  align-items: center;
}
.side-by-side >* {
  margin: 0 5px;
}

.bold {
  font-weight: bold;
}

.margin-sm {
  margin: 5px;
}

.margin {
  margin: 20px;
}

.button-sm {
  padding: 0 10px !important;
}

.pad-sides-sm {
  padding: 0 8px !important;
}

#github-link {
  display: flex !important;
  justify-content: center;
  align-items: center;
  border-bottom: 1px solid;
  margin-bottom: 10px;
}

#overlay, .overlay {
  position: absolute;
  top: 0;
  left: 0;
}

#facesContainer canvas {
  margin: 10px;
}

input[type="file"]::-webkit-file-upload-button {
    background: #26a69a;
    border: 1px solid gray;
    cursor: pointer;
    color: #fff;
    border-radius: .2em;
}