html * {font-family: Arial, sans-serif}
h1{ margin-left: 5%; margin-right: 5%;}
details{ margin-left: 5%; margin-right: 5%; }
figure{ display: inline-block; margin: 2%; text-align:center;}
.topimage {
position: relative;
display: flex;
align-items: center;
justify-content: center;
text-align: center;
height: 60vh;
background-image: url(‘https://www.ac.tuwien.ac.at/wp/wp-content/uploads/vienna-2997032_1280_pixabay.jpg’);
background-size: cover;
background-position: center;
}
.myoverlay{ background-color: rgba(0, 0, 0, 0.5); padding: 1rem 2rem; border-radius: 20px; display: inline-block;}
.maintitle { color: white; font-size: 4rem; margin: 0; }
.subtitle { color: white; margin: 0.5rem 0 0 0;}
summary {
font-size: