#app-container {
    width: 100%;
    height:100vh;
}

body{
    margin: 0;
}

/* https://github.com/tobiasahlin/SpinKit */
.spinner {
    width: 40px;
    height: 40px;
    background-color: #333;

    margin: 100px auto;
    -webkit-animation: sk-rotateplane 1.2s infinite ease-in-out;
    animation: sk-rotateplane 1.2s infinite ease-in-out;
}

@-webkit-keyframes sk-rotateplane {
    0% { -webkit-transform: perspective(120px) }
    50% { -webkit-transform: perspective(120px) rotateY(180deg) }
    100% { -webkit-transform: perspective(120px) rotateY(180deg)  rotateX(180deg) }
}

@keyframes sk-rotateplane {
    0% {
        transform: perspective(120px) rotateX(0deg) rotateY(0deg);
        -webkit-transform: perspective(120px) rotateX(0deg) rotateY(0deg)
    } 50% {
          transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
          -webkit-transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg)
      } 100% {
            transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
            -webkit-transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
        }
}