h1 {color:lightskyblue;}
body {background:black;color:green;}
p {color:green;}
h2 {color: yellow;}
h3 {color: orange;}

img {object-fit: fill;width: 100%;height:100%;
}
table,tr,td{
border-style: solid;border-color: black;height:150px;
}
table.set2 {
  border-collapse: collapse;
}

table.set2 th {
    text-align: center;
  border: 1px solid black;
  height: auto; /* This will work */
}
h4 {color:yellow;}