CodePen

HTML

            
              <input type="text" id="box" value="       ">


            
          
!

CSS

            
              input::selection{
	background: blue;
}
input{
  border: none;
  font-size: 10000px;
  position: absolute;
  padding: 0;
  height: 60%;
  width: 60%;
  left: 20%;
  top: 20%;
}
input:focus{
  outline: none;
}
            
          
!
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JS

            
              blue=function(){
  document.getElementById("box").select()
}
window.addEventListener('click',blue)
blue()
            
          
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