.content_header {
    background-color: #f5f5f5;
    color: #a9a9a9;
}
@media (min-width: 768px) {
    .align-md-left {
        text-align: left;
    }

    .align-md-right {
        text-align: right;
    }

    .align-md-center {
        text-align: center;
    }

    .mobile-phone {
        display: none;
    }
    
    .slider-size {
        height: 30vw;
    }

    .card-img-top {
        height: 15vw;
    }
}

@media (max-width: 767.98px) {
    .align-sm-left {
        text-align: left;
    }

    .align-sm-right {
        text-align: right;
    }

    .align-sm-center {
        text-align: center;
    }

    .desktop-phone {
        display: none;
    }
}