body { background-color: white; }

h1   { color: green; }

tr  {background-color: #D6EEEE;
     border-bottom: 1px solid #ddd;
     }
     
td  {background-color: gray;    }



.AtomStructure { background-color: gray; }



/* Comments 

<h1 style="background-color:DodgerBlue;">DodgerBlue</h1>
<h1 style="background-color:MediumSeaGreen;">MediumSeaGreen</h1>
<h1 style="background-color:Gray;">Gray</h1>
<h1 style="background-color:SlateBlue;">SlateBlue</h1>
<h1 style="background-color:Violet;">Violet</h1>
<h1 style="background-color:LightGray;">LightGray</h1>

*/