@media only screen and (max-width:576px) {
    .top-header-section {
        height: 1000px;
    }

    .title {
        font-size: 3rem;
    }

    .about-bg {
        height: 100%;
        background-image: none;
    }

    .choose-us .row {
        padding: 60px 0;
    }


}

@media only screen and (min-width:576px) {
    .top-header-section {
        height: 1000px;
    }

    .title {
        font-size: 3rem;
    }

    .about-bg {
        height: 100%;
        background-image: none;
    }

    .choose-us .row {
        padding: 60px 0;
    }

}

@media only screen and (min-width:768px) {
    .top-header-section {
        height: 700px;
    }

    .title {
        font-size: 4rem;
    }

    .about-bg {
        height: 100%;
        background-image: none;
    }

    .choose-us .row {
        padding: 60px 0;
    }


}

@media only screen and (min-width:1200px) {
    .top-header-section {
        height: 700px;
    }

    .title {
        font-size: 4rem;
    }

    .about-bg {
        height: 100%;
        background-image: url('../images/about-bg.png');
    }

    .choose-us .row {
        padding: 100px 0;
    }
}