.gird {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-gap: 10px;
}
.cell {
    background-color: rgb(220, 220, 220);
    height: 100px;
}

/* default - small devices */

[class*="col"] {
    grid-column-end: span 12;
}

/* below 600px typically tablet*/

@media only screen and (max-width: 600px) {
    .sm1 {
        grid-column-end: span 12;
    }
    .sm2 {
        grid-column-end: span 6;
    }
    .sm3 {
        grid-column-end: span 4;
    }
    .sm4 {
        grid-column-end: span 3;
    }
    .sm6 {
        grid-column-end: span 2;
    }
    .sm12 {
        grid-column-end: span 1;
    }
}

/* above 601px typically tablet*/

@media only screen and (min-width: 601px) {
    .md1 {
        grid-column-end: span 12;
    }
    .md2 {
        grid-column-end: span 6;
    }
    .md3 {
        grid-column-end: span 4;
    }
    .md4 {
        grid-column-end: span 3;
    }
    .md6 {
        grid-column-end: span 2;
    }
    .md12 {
        grid-column-end: span 1;
    }
}

/* above 1025px typically desktop*/

@media only screen and (min-width: 1025px) {
    .col1 {
        grid-column-end: span 12;
    }
    .col2 {
        grid-column-end: span 6;
    }
    .col3 {
        grid-column-end: span 4;
    }
    .col4 {
        grid-column-end: span 3;
    }
    .col6 {
        grid-column-end: span 2;
    }
    .col12 {
        grid-column-end: span 1;
    }
}

/*