@media only screen {
    body {
        background-color: #1893f8;
        color: #fff;
    }

    a {
        color: magenta;
    }
}

/* For desktop: */
.col-1 {width: 8.33%;}
.col-2 {width: 16.66%;}
.col-3 {width: 25%;}
.col-4 {width: 33.33%;}
.col-5 {width: 41.66%;}
.col-6 {width: 50%;}
.col-7 {width: 58.33%;}
.col-8 {width: 66.66%;}
.col-9 {width: 75%;}
.col-10 {width: 83.33%;}
.col-11 {width: 91.66%;}
.col-12 {width: 100%;}

img {
    width: 100%;
    max-width: 100%;
    height: auto;
}
.background-image-fill {
    width: 100%;
    background-size: 100% 100%;
}
@media only screen and (max-width: 768px) {
    /* For mobile phones: */
    [class*="col-"] {
        width: 100%;
    }
}