html {
    background: rgb(2,0,36);
    background: linear-gradient(90deg, rgba(2,0,36,1) 0%, rgba(121,92,9,1) 0%, rgba(0,212,255,1) 100%);
}
<style >
img {
    max-width: 100%;
    height: auto;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
}

.topnav {
    overflow: hidden;
    background: rgb(238,174,202);
    background: radial-gradient(circle, rgba(238,174,202,1) 0%, rgba(148,187,233,1) 100%);
}

    .topnav a {
        float: left;
        display: block;
        color: #f2f2f2;
        text-align: center;
        padding: 14px 16px;
        text-decoration: none;
        font-size: 30px;
    }

        .topnav a:hover {
            background-color: #ddd;
            color: black;
        }

        .topnav a.active {
            background: rgb(63,94,251);
            background: radial-gradient(circle, rgba(63,94,251,1) 0%, rgba(252,70,107,1) 60%);
            color: white;
        }

    .topnav .icon {
        display: none;
    }

@media screen and (max-width: 600px) {
    .topnav a:not(:first-child) {
        display: none;
    }

    .topnav a.icon {
        float: right;
        display: block;
    }
}

@media screen and (max-width: 600px) {
    .topnav.responsive {
        position: relative;
    }

        .topnav.responsive .icon {
            position: absolute;
            right: 0;
            top: 0;
        }

        .topnav.responsive a {
            float: none;
            display: block;
            text-align: left;
        }
}

</style >