@media (min-width: 300px) and (max-width: 576px){
    .navbar-toggler .toggler-icon {
        width: 40px;
        height: 2px;
        padding: 0px;
        background-color: #000;
        display: block;
        margin: 8px 0;
        position: relative;
        -webkit-transition: all 0.3s ease-out 0s;
        -moz-transition: all 0.3s ease-out 0s;
        -ms-transition: all 0.3s ease-out 0s;
        -o-transition: all 0.3s ease-out 0s;
        transition: all 0.3s ease-out 0s;
    }

    .single_slider {
        height: 250px;
        border-bottom-left-radius: 80px;
    }

    h1.about-title {
        font-size: 20px;
    }
}