* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: #ffffff;
}

h1 {
    font-size: 80px;
}

.grid-gallery {
    width: 80%; /* was 100% */
    /*  max-width: 1440px; */
    margin: 0 auto;
    padding: 50px 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    grid-auto-rows: 250px;
    grid-auto-flow: dense;
    grid-gap: 20px;
}

.grid-gallery .grid-item {
    position: relative;
    background-color: #efefef;
    overflow: hidden;
}

.grid-gallery .grid-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.grid-gallery .grid-item:hover img {
    transform: scale(1.1);
}

.grid-gallery .grid-item a {
    cursor: zoom-in;
}

.grid-gallery .grid-item:nth-child(3n+2) {
    grid-column: span 2;
    grid-row: span 2;
}

.grid-gallery .grid-item:nth-child(4n+1) {
    grid-column: span 1;
    grid-row: span 3;
}

@media (max-width:768px) {
    .grid-gallery {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        grid-auto-rows: 250px;
    }

    .grid-gallery .grid-item:nth-child(3n-2) {
        grid-column: unset;
        grid-row: unset;
    }
}


.btn {
    font-family: "Roboto", sans-serif;
    font-size: 24px;
    font-weight: bold;
    background: #000000;
    border: 3px solid magenta;
    width: 160px;
    padding: 20px;
    text-align: center;
    text-decoration: none;
    text-transform: uppercase;
    color: #fff;
    border-radius: 5px;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(18, 3, 220, 0.1);
    -webkit-transition-duration: 0.3s;
    transition-duration: 0.3s;
    -webkit-transition-property: box-shadow, transform;
    transition-property: box-shadow, transform;
}
.btn:hover, .btn:focus, .btn:active{
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    -webkit-transform: scale(1.1);
    transform: scale(1.1);
}