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

.form-group{ margin: 20px 0; }
input{ height: 30px; width: 100%; padding: 5px; }
button{ 
    background: dodgerblue; 
    color: #fff; 
    padding: 10px; 
    border: solid 1px dodgerblue;
    cursor: pointer;
}

html{
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}

body{
    background: #f7f5ff;
    display: flex;
    flex-flow: column;
    height: 100vh;
}

header{
    background: dodgerblue;
    color: #fff;    
}

header #row{
    height: 50px;
    padding: 0 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header #jumbotron{
    height: 200px;
    background: rgb(11, 131, 250);
    color: white;
    display: grid;
    justify-content: center;
    align-items: center;
}

header #brand{
    flex: 1;
}

header #menu{
    margin-right: 20px;
}

header #menu ul{
    display: flex;
    list-style: none;
}

header #menu ul li{
    margin: 5px;
}

header #menu ul li a{
    height: 40px;
    text-decoration: none;
    display: flex;
    align-items: center;
    padding: 0 10px;
    border-radius: 5px;
    color: #ccc;
}

header #menu ul li a.active{
    border: solid 1px #fff;
    color: #fff;
}

header #menu ul li a:not(.active):hover{
    background: whitesmoke;
}

header #account{
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #fff;
}

main{
    flex: 1;
    margin: 20px 5px;
}

main #products{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 5px;
}

main #products .card{
    height: 170px;
    display: grid;
    justify-content: center;
    align-items: center;
    box-shadow: 0 10px 10px 0 rgba(0, 0, 0, .2);
    color: #fff;
}

main #products .card:first-child{
    background: tomato;
}

main #products .card:nth-child(2){
    background: orange;
}

main #products .card:nth-child(3){
    background: rgb(94, 21, 33);
}

main #products .card:nth-child(4){
    background: plum;
}

main #products .card:nth-child(5){
    background: rgb(25, 109, 67);
}

main #products .card:last-child{
    background: royalblue;    
}

footer{
    padding: 10px 5px;
    background: #222;
    color: #ffff;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

@media screen and (max-width: 600px) {
    main #products{
        grid-template-columns: repeat(2, 1fr);
    }
}