body{
    font-family: "Roboto", 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-weight: 400;
    font-style: normal;
    background-color: mediumpurple;
}
h1{
    font-family: "Roboto", 'Helvetica', Arial, sans-serif;
    font-weight: 900;
    font-style: normal;
}
footer p{
    text-align: center;
    background-color: darkslateblue;
    margin: 0;
    padding: 30px;
    color: #fff;
}
#logo{
width: 70px;
height: auto;
}
header{
    background-color: #b2c5b5; /* fill */ /* rgba(255,255,255,0,5) => 0.5 semi-transparent color */ 
    border: 1px solid #000; /* stroke */ /* width of stroke, type of line, and color */
    height: 55px;
    padding: 20px; /* inset the image */
}
body{
font-family: "Roboto", sans-serif;
font-weight: 400;
font-style: normal;
margin: 0; /* add these two new lines */
padding: 0;
}
header{
    background-color: darkslateblue;
    padding: 30px;
    height: 100px;
    color: white;

    font-size: 50px; /*add these three new lines */
    font-weight: 900;
    font-style: normal;
}
nav ul{
    list-style-type: none;
}
nav ul li{
    display: inline;
    margin-right: 16px;
}
a {text-decoration: none;}
main{
    margin-left: 36px;
}
.thumbnails {
    display: flex;
}
header span{
    position: relative;
    top: -18px;
}
a:hover {
    color: #fff;
    background-color: transparent;
    text-decoration: none;
}