decorate.css

/* General styles */
body, html {
    padding: 0;
    margin: 0;
    height: 100%;
    min-height: 100%;
    background-color:#269;
    background-image: linear-gradient(rgba(255,255,255,.3) 1px, transparent 1px),linear-gradient(90deg, rgba(255,255,255,.3) 1px, transparent 1px);
    background-size: 100px 100px, 100px 100px, 20px 20px, 20px 20px;
    font-family: Roboto, Arial, Helvetica, sans-serif;
}

.fluid {
    width: 100%;
    height: 100%;
    overflow:auto; /* this helps to stretch container */
}

/* Decorate cells for better identification */

#grid {
    background: transparent;
}

#grid>div {
    background: white;
    padding: 10px;
    border: 1px solid #c0c0c0;
    box-shadow: 0px 0px 3px #000;
    border-radius: 5px;
    color: #000;
    text-shadow: 1px 1px 3px #c0c0c0;
    margin: 5px;
    cursor: pointer;
}

#grid>div:nth-child(n+1) {
    background: rgba(0, 255, 0, 0.5);
    border: 1px solid green;
}

#grid>div:nth-child(2n) {
    background: rgba(0, 255, 255, 0.5);
    border: 1px solid lightblue;
}

#grid>div:nth-child(3n) {
    background: rgba(0, 0, 255, 0.5);
    border: 1px solid blue;
}

#grid>div:nth-child(4n) {
    background: rgba(255, 0, 255, 0.5);
    border: 1px solid purple;
}

#grid>div:nth-child(5n) {
    background: rgba(255, 0, 0, 0.5);
    border: 1px solid red;
}

#grid>div:nth-child(6n) {
    background: rgba(255, 127, 0, 0.5);
    border: 1px solid orange;
}

#grid>div:nth-child(7n) {
    background: rgba(255, 255, 0, 0.5);
    border: 1px solid yellow;
}

#grid>div:nth-child(8n) {
    background: rgba(0, 255, 0, 0.5);
    border: 1px solid green;
}
#grid>div:nth-child(n).selected-grid{
    border: 2px dashed black;
}