#div1, #div2
   {width:334px; height:79px;margin:10px;border:2px solid; border-color:black
   }

   #divshell
   { display: block; height:170px;position:absolute;
   }
   

   #div3, #div4, #div5, #div6, #div7
   { height:40px;margin:10px;}
  

   input[type=range]::-moz-range-track {  
        border-radius: 8px;   
        border: 0px solid #bdc3c7;	  
        background-color: #fff; 
    }  
    input[type=range]::-moz-range-thumb {  
        background: #ecf0f1;  
        border: 1px solid #bdc3c7;  
        width: 35px;  
        height: 35px;  
        border-radius: 10px;  
        cursor: pointer;  
    }

  input[type="range"]::-moz-range-track {
  padding: 0 10px;
  background: linear-gradient(green,yellow,red);
  
  
}