body{   
  background: #eee;  
}  
#frm{  
  border: solid gray 1px;  
  width:25%;  
  border-radius: 2px;  
  margin: 120px auto;  
  background: white;  
  padding: 50px;  
}  
#btn{  
  color: #fff;  
  background: #337ab7;  
  padding: 7px;  
  margin-left: 70%;  
}  
.gallery img {
  width: 15%;
  height: auto;
  border-radius: 5px;
  cursor: pointer;
  transition: .3s;
}