body {
    background-color: black;
}

.bulbListItem {
    text-align: center;
    color: white;
    display: inline-block;
    font-family: sans-serif;
    font-size: 80pt;

    margin: 10pt;

    width: 500pt;
    background-color: #222;
    border-radius: 20pt;
}

.button {
    font-size: 75pt;
    height: 100pt;
    display: inline-block;
    width: 50%;
}

.on {
    background-color: green;
    text-align: right;
}

.off {
    background-color: red;
    text-align: left;
}

@media (max-width: 1600pt) {
    .bulbListItem {
        width: 90%;
        margin-left: 5%;
        margin-top: 5%;
        margin-bottom: 2%;
    }
}

@media (max-width: 600pt) {
    .bulbListItem {
        font-size: 50pt;
        display: block;
    }

    .button {
    }
}

body {
    background-color: black;
}

.bulbListItem {
    text-align: center;
    color: white;
    display: inline-block;
    font-family: sans-serif;
    font-size: 80pt;

    margin: 10pt;

    width: 500pt;
    background-color: #222;
    border-radius: 20pt;
}

.button {
    font-size: 75pt;
    height: 100pt;
    display: inline-block;
    width: 50%;
}

.on {
    background-color: green;
    text-align: right;
}

.off {
    background-color: red;
    text-align: left;
}

@media (max-width: 1600pt) {
    .bulbListItem {
        width: 90%;
        margin-left: 5%;
        margin-top: 5%;
        margin-bottom: 2%;
    }
}

@media (max-width: 600pt) {
    .bulbListItem {
        font-size: 50pt;
        display: block;
    }
}

Remove an unused media query selector
Remove an unused media query selector
