:root {}

body {
    font-family: 'Futura', 'Hiragino sans', sans-serif;
    font-weight: 300;
    letter-spacing: 0.1vw;
    padding: 0;
    margin: 0;
}

.content {
    margin: 0;
    width: 100vw;
    height: 100vh;
    background-color: white;
}

.center {
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translateY(-50%) translateX(-50%);
    transform: translateY(-50%) translateX(-50%);
}

.box {
    margin: auto;
    width: 30px;
    height: 30px;
    background-color: aquamarine;
}