.solar-box{

max-width:500px;

margin:40px auto;

padding:20px;

border:1px solid #ddd;

border-radius:10px;

box-shadow:0 2px 8px rgba(0,0,0,.1);

}

.solar-box input{

width:100%;

padding:12px;

margin-bottom:15px;

}

.solar-box button{

width:100%;

padding:12px;

background:#0b8f45;

color:#fff;

border:none;

cursor:pointer;

font-size:16px;

}

#result{

margin-top:20px;

padding:15px;

background:#f5f5f5;

border-radius:6px;

}