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

html {
    height: 100%;
}

body {
    min-height: 100vh;
    background: #b3ccfa;
    background-image: linear-gradient(to right, #b3ccfa, white);
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-size: cover;
    padding-top: 120px;
}

header {
    background: white;
    width: 100%;
    padding: 7px 2.5%;
    border-bottom: 2px solid black;
    color: black;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}

header h4 {
    font-size: 40px;
    margin: 0;
}

header a {
    position: absolute;
    left: 10px;
    color: black;
}
header, header * {
    text-decoration: none;
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px;
    padding: 20px;
    width: 100%;
    box-sizing: border-box;
}

.catalog-item {
    border: 2px solid black;
    border-radius: 16px;
    padding: 15px;
    
}

.catalog-item img {
    background: white;
    border-radius: 10px;
    padding: 15px;
    box-sizing: border-box;
    width: 100%;
    max-width: 300px;
    height: auto;
    display: block;
    margin: 0 auto;
}

@media (max-width: 600px) {
    .catalog-grid {
        grid-template-columns: 1fr;
    }
}