roll20-character-sheets/True20/true20.css

.charsheet{
    background-color: #ffffff;
}

table td{
    border: 1px solid black;  
    text-align: center; 
}

table:first-child td:first-child{
    background-color: #b2b2b2;
    padding-left: 15px;
    padding-right: 15px;
}
.sheet-blackmenu{
    background-color:#000000;
    color: #ffffff;
    text-align: center;
    }
.sheet-greymenu{
    background-color:#b2b2b2;
    text-align: center;
    }