h1, h3 {
    text-align: center;
}

table.cooling {
    border-spacing: 50px 0px;
    text-decoration: underline;
    font-weight: 1000;
    margin-left: auto;
    margin-right: auto;
}

.right {
    text-align: right;
}

.cell1b {
    text-align: left;
    vertical-align: top;
}

.cell3b {
    text-align: right;
    vertical-align: bottom;
}

table.b {
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

table.c {
    margin-left: auto;
    margin-right: auto;
    width: 300px;
    height: 300px;
}

.red {
    background-color: red
}

.green {
    background-color: green;
}

.blue {
    background-color: blue;
}

.black {
    background-color: black;
}

.yellow {
    background-color: yellow;
}

.red, .green, .blue, .black, .yellow {
    border: 1px solid black;
}