body {
    font-family:Arial, Helvetica, sans-serif;
    font-size: 16pt;
    xdisplay: flex;
    padding: 1em;
    height: 100%;
    background-color:	#ffffff;
    background-image:	url("mainboard.jpg");
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}
@media (min-width: 300px) {
    html, body {
    font-size: 12pt;
    }
}
@media (min-width: 600px) {
    html, body {
    font-size: 20pt;
    }
}
@media (min-width: 800px) {
    html, body {
    font-size: 28pt;
    }
}
@media (min-width: 1000px) {
    html, body {
    font-size: 36pt;
    }
}
@media (min-width: 1200px) {
    html, body {
    font-size: 44pt;
    }
}
@media (min-width: 1400px) {
    html, body {
    font-size: 48pt;
    }
}

.title {
    display: block;
    margin-left:auto;
    margin-right:auto;
    font-size: 1rem;
    color: #ffffff;
    text-shadow: 3px 0 #000, -3px 0 #000, 0 3px #000, 0 -3px #000,
               1px 1px #000, -1px -1px #000, 1px -1px #000, -1px 1px #000;
}

.grid {
    margin-left:auto;
    margin-right:auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.tile {
    display: block;
    background-color:#def;
    opacity: 0.9;
    border: 3px solid black;
    border-radius: 8px;
    text-align: center;
    line-height: 1.4;
    padding-top: 0.4em;
    padding-bottom: 0.4em;
    padding-left: 1em;
    padding-right: 1em;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.tile > a > div {
    font-size: 2.5em;
}
.tile > a > span {
    font-size: 0.8em;
}
a {
    text-decoration: none;
}