#editor { 
        position: absolute;
        font-size: 16px;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        border-left: 2px solid green;
    }
    @media screen and (max-width: 520px){
    	#editor { 
        width: 100%;
        border-left: 2px solid green;            
        position: absolute;
        font-size: 14px;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
    }
    }