body{
    background-color: darksalmon;
}

.fill{
    background-color: white;
    position: relative;
    height: 150px;
    width: 150px;
    top: 5px;
    left: 5px;
    cursor: pointer;
}

.empty{
    display: inline-block;
    height: 160px;
    width: 160px;
    margin: 10px;
    border: 3px salmon solid;
    background-color: black;
}

.hold {
    border: solid #ccc 4px;
}

.hovered {
    background: #f4f4f4;
    border-style: dashed;
}

.invisible {
    display: none;
}