*{
  margin: 0px;
  padding: 0px;
}
body{
  font-family: sans-serif;
  background-color:#942d9954;
  display: flex;
  align-content: center;
  justify-content:center;
  padding: 15%;
}
.container{
  box-shadow: 0 10px 15px 15px rgba(50,50,50,0.4);
}
.body{
  padding: 30px;
  align-items: center;
  justify-content:center;
  background-color: #FFF;
  line-height: 30px;
  font-size: 15px;
}
#heading{
  border-bottom: 3px solid red;
  text-align: center;
  background-color:green;
  height: 20px;
  padding: 10px;
  font-size: 1.3em;
  color: #FFF;
}

#btn{
  padding: 5px;
  background-color: grey;
  border: 2px solid blue;
  border-radius: 10%;
  margin: 10px;
  margin-left: 150px;

}

hr{
  margin-top: 10px;
  height:2px;
}

.calc{
  margin-top: 4px;
  line-height: 15px;
}
#calculation{
  font-size: 10px;
}
#author{
  color: red;
  font-size: 10px;
  float: right;
}