Copy the code in the grey box

#spu-55 { 
border-radius:6px !important; 
background-image:url('https://thebohemian.boutique/wp-content/uploads/2016/08/lightbox-1.jpg'); 
height: 352px; 
} 

#spu-55 #mc4wp-form-2, #spu-55 #mc4wp-form-1{ 
margin-top:196px !important; 
width:260px; 
float: left; 
} 

#spu-55 #mc4wp-form-2 input[type="email"], #spu-55 #mc4wp-form-1 input[type="email"]{ 
width: 100%; 
margin-bottom: 10px; 
} 

#spu-55 #mc4wp-form-2 input[type="submit"], #spu-55 #mc4wp-form-1 input[type="submit"]{ 
width: 100%; 
}

and paste it in the POP-UP CSS box