style.css

li {
    list-style: none;
    cursor: pointer;
}

ul#cart {
    min-height: 100px;
    max-width: 200px;			
    background-color: lightskyblue;
}

div {
    width: 100px;
    height: 50px;
    
}

#product-1 div {
    background-color: red;
}

#product-2 div {
    background-color: green;
}

#product-3 div {
    background-color: blue;
}

span {
    font-weight: bolder;
}