#main {
    width: 100%;
    height: 500px;
    display: flex;
}
    #a-cappella {
        width: 100%;
        background-image: url("../images/a-cappella.jpeg");
        transition: width 0.5s;
    }
        #a-cappella:hover {
            width: 150%;
            transition: 0.5s;
        }

    #jazz {
        width: 100%;
        background-image: url("../images/sax.jpg");
        transition: width 0.5s;
    }
        #jazz:hover {
            width: 150%;
            transition: 0.5s;
        }

    #choir {
        width: 100%;
        background-image: url("../images/choir.jpg");
        transition: width 0.5s;
    }
        #choir:hover {
            width: 150%;
            transition: 0.5s;
        }

    .picture-link {
        display: block;
        height: 100%px;
        background-size: cover;
        color: rgb(161, 161, 161);
        border: 3px solid white;
    }
        .link-inside {
            padding: 20px;
            padding-top: 10px;
            color: inherit;
            text-decoration: none;
        }

        .section-header {
            width: 100%;
            margin-top: -22px;
            background: white;
            padding-top: 50px;
        }
        
        .section-header:hover {
            color: orange;
            transition: 0.5s;
        }

@media all and (max-width: 1000px) {
    #main {
        width: 90%;
        flex-direction: column;
        height: auto;
    }

    .picture-link {
        height: 500px;
        margin: 20px;
    }

    #a-cappella {
        margin-top: 0;
    }

        #a-cappella:hover {
            width: 100%;
            transition: 0.5s;
        }

        #jazz:hover {
            width: 100%;
            transition: 0.5s;
        }

    #jazz {
        margin-bottom: 30px;
    }

        #choir:hover {
            width: 100%;
            transition: 0.5s;
        }
}