html,
body {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

body {
    display: grid;
    grid-template-rows: auto 1fr;
}

nav {
    grid-row: 1;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-weight: bold;
    font-size: medium;
}

nav div {
    position: relative;
    display: inline-flex;
    list-style-type: none;
    float: right;
    gap: 4%;
    padding: 2em 6em 0 0;
}

nav a {
    color: rgb(96, 96, 96);
    background-color: transparent;
    border: none;
    text-decoration: none;
    width: 128px;
    height: 32px;
    line-height: 32px;
    text-align: center;
}

nav a:hover {
    color: rgb(116, 116, 116);
    transition: color 0.1s ease;
}

nav a.Active {
    pointer-events: none;
    border: 0.05em solid rgb(96, 96, 96);
    color: rgb(96, 96, 96);
    background-color: transparent;
    text-decoration: none;
    width: 128px;
    height: 32px;
    line-height: 32px;
    text-align: center;
}

nav a.Active:hover {
    border: 0.05em solid rgb(116, 116, 116);
    color: rgb(116, 116, 116);
    transition: color 0.1s ease;
}

iframe {
    grid-row: 2;
    width: 100%;
    height: 100%;
    border: none;
}