.calculator td {
    background-color: white;
    border: 1px #8C8C8C solid;
    padding: 8px;
    }
.calculator .highlighted td {
    background-color: #0F7D91;
    color: white;
    border: 1px #8C8C8C solid;
    padding: 10px;
    font-weight: bold;
    }
p {
    line-height: 20px;
    }