html {
    background-color: #121212;
}

main {
    text-align: center;
}

table {
    border-collapse: collapse;
    font-family: Calibri, sans-serif;
    margin: auto;
    background-color: #BBB;
}

button {
    padding: 6px;
}

table caption {
    color: #C0BCB5;
}

td {
    font-size: 32px;
    border: solid thin black;
    height: 2.5em;
    width: 2.5em;
    text-align: center;
    padding: 0;
}

#number_bar {
    margin-top: 8px;
}

#number_bar td {
    border: solid medium;
}

#number_bar button {
    width: 100%;
    height: 100%;
    padding: 0px;
    border: none;
    font-size: 24px;
    background-color: rgb(200, 200, 200, 0.2);
}

#number_bar button:hover {
    background-color: rgb(250, 250, 250, 0.4);
    cursor: pointer;
}

caption h1 {
    display: inline-block;
}

colgroup, tbody {
    border: solid medium black;
}

.base {
    font-weight: bolder;
    color: #2B436E;
    cursor: default;
}

.editable {
    color: black;
    cursor: pointer;
}