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

body {
    font-family: Arial, sans-serif;
    height: 100vh;
	padding-top: 5vh;
    margin: 0;
    background-color: #f0f0f0;
	box-sizing: border-box;
}

.gallery {
    width: 70%;
    margin: 0 auto;
}

.gallery-item {
    width: 30%;
    height: auto;
	float: left;
    overflow: hidden;
    border: 2px inset #ccc;
    background-color: #fff;
    padding: 20px;
	box-shadow: 0 0 25px tomato inset;
}

.gallery-item img {
    width: 100%;
    height: 100%;
}