html {
  font-family: Arial, Helvetica, sans-serif;
  padding:  30px 100px;

}

#bra-calculator {
   background: #fed1e5;
   padding: 30px 30px 30px;
   max-width: 400px;
   margin: 20px auto 20px;
   text-align: center;
   border-radius: 1px;
 }
 
 .title {
   font-size: 25px;
   font-weight: bold;
   margin-bottom: 10px;
 }
 

 label {
   font-size: 16px;
   display: block;
   margin: 10px auto;
 }
 
 .error-messagebra {
   font-size: 14px;
   margin: 15px auto;
   text-align: center;
   font-weight: bold;
   display: none;
 }
 
 .error-messagebra.show {
   display: block;
 }
 
 input[type="number"] {
   border: 0;
   border-radius: 1px;
   font-size: 12px;
   padding: 10px 10px;
   text-align: center;
   outline: none;
   width: 70%;
 }
 
 input[type="number"].error {
   border: 2px solid red;
 }
 

 input[type=submit]:hover,
 input[type=submit]:active {
   transform: scale(0.95);
 }
 
 #bra-results {
   font-size: 28px;
 }
 
 #bra-results.show {
   display: block;
 }
 
 #bra-results span {
   font-weight: bold;
 }
 
 @media screen and (max-width: 767px) {
   #bra-calculator {
  padding-left: 15px;
  padding-right: 15px;
   }
 
   .half {
  float: none;
  width: 100%;
  padding: 20px 0;
   }
 
   input[type="number"] {
  width: 80%;
   }
 }

 h1 {
  text-align: center;
 }