.grid-container {
    display: grid;
    grid-template-columns: auto auto auto;
    grid-gap: 0px;
    padding-top: 5px;
    padding-bottom: 5px;
    
    background-color: #FFFFFF;
    border: 2px solid rgba(128, 128, 128, 1.0); 
}

.grid-container > div {
    background-color: rgba(255, 255, 255, 0.0);
    text-align: center;
    padding: 0px;
    margin: 5px;
    font-size: 2em;
    border: 2px solid rgba(200, 200, 200, 1.0);
}