* {
    margin: 0;
    padding: 0;
}
html{
    box-sizing: border-box;
    font-family: sans-serif;
    max-width: 1080px;
    margin: 0 auto;
}

body {
    max-height: 100vh;

    background: #ccc;
    display: flex;
    justify-content: center;
}
header {
    margin-top: 20px;
    text-align: center;
}
.topBox {
        text-align: center;
    }
    .topBox {
        height: auto;
        background-color: lightgreen;
        border-style: groove;
        border-width: 20px;
        border-color: yellow;
        margin: 20px 20px 50px 20px;
        padding: 20px
    }
    nav p {
        text-align: center; 
        margin-bottom: 30px;
    }
.wrapper {
    display: block;
}
.gallery {
    margin-top: 20px;
    display: grid;
    grid-template-columns: 1fr;
    grid-gap: 30px;
}
.gallery img {
    width: 90%;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(104,104,104,0.8);
}

footer {
    margin: 15px;
    text-align: center;
}

@media  (min-width: 756px) {
    .gallery {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        
    }
}