body{
  margin: 0;
  background-color: #60a4d2;/*#2b6c97;*/
}

#header{
  background-color: #bcd5e7;
  border-bottom: 10px;
  border-style: none none solid none;
  border-color: #f2f2f2;
}

header{
  margin: auto;
  width: 50%;
  padding: 3% 0px 3% 0px;
  text-align: center;
  font-size: 30px;
  font-family: monospace;
  color: #102b3c;
}

#user-input{
  margin: auto;
  width: 100%;
  text-align: center;
  padding: 2% 0px 2% 0px;
}

.subtitle{
  font-size: 20px;
  font-family: monospace;
  color: #0a1d29;
}

.inputbox{
  font-size: 18px;
  width: 200px;
  text-align: center;
  border-width:0px;
  border:none;
  border-radius: 10px;
  background-color: #f2f2f2;
  font-family: monospace;
  color: #0a1d29;
}

#calculate{
  margin: 0 auto;
  display: block;
  border-radius: 40px;
  background-color: rgba(255, 255, 255, 0);

  transition: box-shadow .7s ease-in-out, background-color .7s ease-in-out;
}

#calc-text{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 16px;
  font-family: monospace;
}

#calculate-overlay:hover + #calculate{
   cursor: pointer;
   background-color: rgba(255, 255, 0, 0.5);
   box-shadow: 0px 0px 20px 10px rgba(255, 255, 0, 0.6);
}

#calc-btn{
  margin-top: 40px;
  margin-bottom: 40px;
  position: relative;
  text-align: center;
}

#calculate-overlay{
  z-index: 3;
  filter: opacity(0%);
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 40px;
  background-color: rgba(255, 255, 255, 0);
  transition: box-shadow .7s ease-in-out, background-color .7s ease-in-out;
  cursor: pointer;
}