html, body {
    height:100%;
}
.container {
    padding-top: 50px;
    padding-bottom: 50px;
    background-color: white;
}
.hero-image {
    background-image: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url("AndroidBanner.png");
    height: 25%;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
}
.hero-text {
    text-align: center;
    position: absolute;
    top: 50%;
    left: 50%;
    color: white;
    transform: translate(-50%, -50%);
}
#description h4{
    text-align: center;
    color: red;
}
#imgDownload {
    background-color: blueviolet;
    display:block;
    align-items:center;
    justify-content:center;
}