* {
    box-sizing: border-box;
}
.row::after {
    content: "";
    clear: both;
    display: block;
    /*border: 1px red solid;*/
}

[class*="col-"] {
    float: left;
    /*border: 1px blue solid;*/
}

aside {
    background-color: #bec05e;
    background: linear-gradient(#bec05e, #5c5e2f);
    padding: 15px;
    color: #ffffff;
    text-align: center;
    font-size: 14px;
    box-shadow: 10px 10px 3px #c1c1c1, 10px 10px 2px #878787;
}
main{
    text-align: center;
    padding: 15px;
}

form{
    text-align: left;
}

.img_responsive {
    width: 100%;
    height: auto;
}

/* For mobile phones: */
/*[class*="col-"] {*/
    /*width: 100%;*/
/*}*/


/* When the screen is less than 600 pixels wide, hide all links, except for the first one ("Home").
Show the link that contains should open and close the topnav (.icon) */
@media screen and (max-width: 600px) {
    /*For mobiles*/
    .topnav a:not(:first-child) {display: none;}
    .topnav a.icon {
        float: right;
        display: block;
    }

    .topnav.responsive {position: relative;}
    .topnav.responsive a.icon {
        position: absolute;
        right: 0;
        top: 0;
    }
    .topnav.responsive a {
        float: none;
        display: block;
        text-align: left;
    }
}


@media only screen and (max-width: 600px){
    /* For tablets: */
    .col-m-1 {width: 8.33%;}
    .col-m-2 {width: 16.66%;}
    .col-m-3 {width: 25%;}
    .col-m-4 {width: 33.33%;}
    .col-m-5 {width: 41.66%;}
    .col-m-6 {width: 50%;}
    .col-m-7 {width: 58.33%;}
    .col-m-8 {width: 66.66%;}
    .col-m-9 {width: 75%;}
    .col-m-10 {width: 83.33%;}
    .col-m-11 {width: 91.66%;}
    .col-m-12 {width: 100%;}

    .p-4{
        padding: 15px;
    }

}


@media only screen and (min-width: 600px) and (max-width: 768px){
    /* For tablets: */
    .col-t-1 {width: 8.33%;}
    .col-t-2 {width: 16.66%;}
    .col-t-3 {width: 25%;}
    .col-t-4 {width: 33.33%;}
    .col-t-5 {width: 41.66%;}
    .col-t-6 {width: 50%;}
    .col-t-7 {width: 58.33%;}
    .col-t-8 {width: 66.66%;}
    .col-t-9 {width: 75%;}
    .col-t-10 {width: 83.33%;}
    .col-t-11 {width: 91.66%;}
    .col-t-12 {width: 100%;}

    a{
        width: 100%;
    }

    .p-4{
        padding: 10px;
    }

    #test{
        display: none;
    }

}
@media only screen and (min-width: 768px) {
    /* For desktop: */
    .col-d-1 {width: 8.33%;}
    .col-d-2 {width: 16.66%;}
    .col-d-3 {width: 25%;}
    .col-d-4 {width: 33.33%;}
    .col-d-5 {width: 41.66%;}
    .col-d-6 {width: 50%;}
    .col-d-7 {width: 58.33%;}
    .col-d-8 {width: 66.66%;}
    .col-d-9 {width: 75%;}
    .col-d-10 {width: 83.33%;}
    .col-d-11 {width: 91.66%;}
    .col-d-12 {width: 100%;}

    li {
        float: left;
    }

    a{
        width: 20%;
    }

    .p-4{
        padding: 10px;
    }

}