table {
    border-spacing: 0;
    border-collapse: collapse;
    overflow: hidden;
    z-index: 1;
}

td, th {
    cursor: pointer;
    padding: 10px;
    position: relative;
    border-collapse: collapse;
    border: 1px solid black;
}

td:hover::after { 
    background-color: #FFA;
    content: '\00a0';  
    height: 10000px;    
    left: 0;
    position: absolute;  
    top: -5000px;
    width: 100%;
    z-index: -1;        
}

tr:hover {
    background-color: #FFA;
}