.instructionbox { z-index:2; left:6%; position:fixed; width:40%; min-width:265px; margin: 10px 0px -10px 20px; }
.textbox { display:block; background-color:white; border-style:solid; border-color:green; } 
.invisible { display: none; }
#viewinstructions { background-color:white; }
.shutX 
  { 
    background-size: contain; 
    background-repeat: no-repeat; 
    height: 1.5vh; 
    min-height: 15px;
    width: 1.5vh; 
    min-width: 15px;
    background-image:url("/style/Xblack.png"); 
    background-color:lightgreen;
    margin: 10px 0px -10px 20px; 
  }