*{
    padding: 0;
    margin: 0;
    background-color: rgb(35, 35, 35);
    font-family: Helvetica;
}

#header {
    padding-top: 10px;
    padding-bottom: 10px;
}

#header, #results {
    color: white;
}

#header, #theGrid {
    width: 350px;
}

#results {
    width: 334px;
    font-family: monospace;
    font-size: 28px;
    text-align: left;
    font-weight: bolder;
    border: 2px solid white;
    height: 50px;
    margin-left: 5px;
    margin-right: 5px;
    padding-left: 5px;
    padding-right: 5px;
    overflow: hidden;
}

#theGrid {
    display: grid;
    height: 350px;
    grid-template-rows: repeat(5, auto);
    grid-template-columns: repeat(4, 1fr);
}

[id^="button"] {
    border-width: 1px;
    color: white;
    border: 1px solid rgb(35, 35, 35);
    display: flex;
    align-items: center;
    justify-content: center;
}

#button0, #button1, #button2, #button3, #button7, #button11, #button15 {
    background-color: rgb(20, 20, 20);
}

#button4, #button5, #button6, #button8, #button9, #button10, #button12, #button13, #button14, #button16, #button17, #button18 {
    background-color: rgb(7, 7, 7);
}

#button19 {
    background-color: rgb(51, 50, 49);
}