html, body {
    height: 100%;
    margin: 0;
}

.grid {
    min-height: 100vh;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-gap: 10px;
}

nav {
    grid-column: span 12; 
}

.cell {
    background-color: rgb(220, 220, 220);
    height: auto!important;
    margin: 8px;
    padding: 20px;
}


.cell.footer {
    grid-column: 1 / -1;
}
 
 
/* default-small-devices*/
[class*="col"]{
grid-column-end: span 12;
}
/* under 600px typically phones */
@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 tablets */
@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;
}
.cmd6{
    grid-column-end:span 2;
}
.md12{
    grid-column-end:span 1;
}
}
/* above 1025px typically desktops */
@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;
}
}

/* header and nav bar code */

.logo {
    display: grid;
    grid-template-columns: repeat (12, 1fr);
        gap: 30px;
}
header {
    padding: 20px 40px;
    background: #ccc;
    align-items: center;
}
header h1{
    grid-column: span 6;
    
}
header nav {
    grid-column: 7 / span 10;
    justify-self: end;
}
header nav a {
    color: #333;
    margin-left: 10px;
    text-decoration: none;
}
    /* header and nav bar code end */