body {
    font-size: 12px;
    font-family: Arial, Helvetica, sans-serif;
    color: black;
    margin-left: 0;
    margin-right: 0;
    background: lightgray;
}

header {
    text-align: center;
    margin-top: 4vh;
}

.img-circle {
    border-radius: 50%;
}

.avatar {
    background: white;
    max-height: 90vh;
    max-width: 90vw;
    height: 400px;
    min-height: 100px;
    width: auto;
}