#block
{

margin-bottom: 7px;
margin-right: 10px;
height: 190px;
border: 1px dotted #4a4a4a;

}

  #block_1
   {
   width: 37%;
   height: 190px;
   float: left;
  } 
  
   #block_2
   {
   width: 36%;
   height: 190px;
   float: right;
   margin-left: 3px;
  }