body {
    overflow: scroll;
}
.catalog-container {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    justify-content: flex-start;
    box-sizing: inherit;
}

.catalog-categories {
    padding: 5px;
    margin: 5px;
    border: solid 1px gray;
    border-radius: 5px;
}

.catalog-categories a {
    text-decoration: none;
}

.catalog-products {
    display: flex;
    flex-wrap: wrap;
    flex-grow: 1;
    align-items: stretch;
    padding: 0 5px;
}

.product {
    border: solid 1px gray;
    border-radius: 5px;
    padding: 8px;
    margin: 4px;
}

.product img {
    border-radius: 5%; /* Радиус скругления */
    box-shadow: 0 0 0 3px transparent; /* Параметры теней */
    width: 210px;
    height: 210px;
    margin-bottom: 5px;
}

/* для мобилок <= 700px */
@media screen and (max-width: 701px) {
    .catalog-container {
        display: block;
    }
    .catalog-categories {
        flex: 1;
    }
    .catalog-products {
        grid-template-columns: repeat(1, 1fr);
        display: grid;
        grid-gap: 8px;
    }
    .product {
        display: inline-flex;
    }
    .product img {
        width: 8em;
        height: 8em;
        margin-bottom: 0;
        margin-right: 5px;
    }
}

/* для экранов > 700px */
@media screen and (min-width: 700px) {
    .product {
        display: flex;
        flex-direction: column;
    }
    .catalog-categories {
        display: block;
        min-width: 230px;
    }
}