body {
    background: url(https://i.pinimg.com/564x/18/3c/f6/183cf619121abc269f4561e404f1a5d6.jpg);
    background-size: cover;
    background-position: center;
    
}

button {
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 10px 20px;
    display: inline-block;
    font-size: 16px;
    margin: 10px 5px;
    border-radius: 17px;
}

.container {
    text-align: center;
    padding: 20px;
}
.containers {
    background-color: #a8a8a8 ;
}
h1 {
    background-color: #a8a8a8;
}
.imgrid img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

@media screen and (max-width: 767px) { 
    .imgrid img {
        max-height: 400px; 
    }

    button {
        font-size: 14px;
        padding: 8px 16px;
    }
}

@media screen and (max-width: 479px) {
    .imgrid img {
        max-height: 300px;
    }

    button {
        font-size: 12px;
        padding: 6px 12px;
    }
}