#main_frame
   {
    position:relative;
    max-width:1200px;
   	width:100%;
    }


/* If the screen size is 601px wide or more, set the font-size of <div> to 80px */
   @media screen and (min-width: 601px) {
    #main_frame{margin:auto;}
    }

   /* If the screen size is 600px wide or less, set the font-size of <div> to 30px */
   @media screen and (max-width: 600px) {
     #main_frame{margin:0;}
    }

   @media (prefers-color-scheme: dark) {
      body{
         background-color: #000000;
         color: #c4c4c4;}
      #main_text{color: #c4c4c4;}
      a:link{color: #c4c4c4;}
      a:visited{color: #464646;}
   }