how to Remove border in input while focus in css

css 
#search{ 
width : 300px; 
height:50px; 
padding-left:10px; 
border:1px solid black;
border-left: unset; 
}  

#search:focus{ 
border: unset; 
} 

css 
#search{ 
width : 300px; 
height:50px; 
padding-left:10px; 
border:1px solid black;
border-left: unset; 
}  

#search:focus{ 
border: unset; 
}