*{
    box-sizing: border-box;
}


body{
    padding: 30px;
}

h1{
    width: 100%;
    font-size: 3em;
    color: darkgray;
    border-bottom: 5px double darkgray;
}

header, div{
    width: 100%;
}

ul{
    width: 100%;
    display: flex;
    justify-content: start;
    padding: 20px;
}

li{
    list-style-type: none;
    margin-left: 2%;
    border-right: 2px solid gray;
}

li:first-of-type{
    margin-left: 0px;
}

li:last-of-type{
    border-radius: none;
}

main{
    width: 100%;
    margin: 10px auto;
    display: flex;
    flex-wrap: wrap;
}

main > img{
    width: 65%;
}

article{
    width: 25%;
    padding: 0px 20px;
    display: flex;
    flex-wrap: wrap;
}

article > img{
    margin: 30px 0px;
    width: 50%;
}