* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: rgb(64, 64, 64);
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.header {
    background-color: rgb(38, 0, 73);
    color: white;
    text-align: center;
    padding: 8px;
    width: 100%;
    flex-shrink: 0;
}

.header span {
    background-color: white;
    color: black;
    border-left: 3px solid grey;
    padding: 3px 6px;
    margin-left: 4px;
}

.paper {
    background-color: white;
    margin: 16px auto;
    width: 100%;
    max-width: 1000px;
    flex: 1;
    min-height: 0; /* important for flex children */
}

.paper iframe {
    display: block;
    width: 100%;
    height: 100%;
    border: none;
    min-height: 80vh;
}