main section{
    border-left: 3px #1e2c4d;
    border-right: 3px #1e2c4d;
}
main section div a{
    text-decoration: none;
    color: blue;
}

main section div a:hover{
    text-decoration: none;
    color: #3366cc;
    transition: all .3s;
}

/**Escritorio**/
@media (min-width: 991px) {
    main section{
        text-align: center;
    }
    
    main section div{
        margin-left: auto;
        margin-right: auto;
    }
}

/**Celular**/
@media (max-width: 767px) {
    main section{
        text-align: center;
    }
    
    main section div{
        margin-left: auto;
        margin-right: auto;
    }
}
/**Tablet**/

@media (min-width: 768px) and (max-width: 990px) {
    main section{
        text-align: center;
    }
    
    main section div{
        margin-left: auto;
        margin-right: auto;
    }

}