#nav_menu ul{display: flex;
background-color: black;
width: 100%;
justify-content: space-around;
flex-basis: 100%;
list-style-type: none;
margin: 0;
padding: 0;}

#nav_menu a{color: #FFFFFF;}
#nav_menu ul li {flex-basis: 20%;}

main{display: flex;}
article{margin: 1.5em 2.52525% 0 2.0202%;
width: 60%;}

footer{background-color: pink;}
aside{width: 40%;
padding:2.0202%;
max-width: 200px;min-height: 180px;
background-color: #ffebc6;
margin: 1.5em 2.0202% 0 0;}
article img { max-width: 100%; margin-bottom: 1em; }

#GalGrid{display: grid;
grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
grid-gap: 20px;
align-self: stretch;}

#GalGrid img {
border: 1px solid #cccccc;
box-shadow: 2px 2px 6px 0px  rgba(0,0,0,0.3);
max-width: 100%;
}