.wrapper {
  width: 400px;
  min-height: 300px;
  margin: 50px auto;
}

.form-container {
  float: left;
  background-color: #CDCDCD;
  padding: 50px;
  padding-top: 30px;
  -moz-border-radius: 5px;
  -webkit-border-radius: 5px;
  border-radius: 5px;
  box-shadow: 0px 0px 5px #000;
}
.form-container h1 {
  text-align: center;
}

.form-div {
  width: 100%;
  float: left;
  margin-bottom: 10px;
}

.form-div span, .total-container span {
  width: 100px;
  float: left;
}

.form-div input {
  float: left;
  width: 100%;
  height: 30px;
  -moz-border-radius: 5px;
  -webkit-border-radius: 5px;
  border-radius: 5px;
  padding: 5px;
}

.total-container {
  float: left;
  margin-top: 40px;
}
.total-container span {
  float: left;
  width: 20px;
  font-size: 25px;
}

#total {
  float: left;
  height: 20px;
  width: 100px;
  background-color: #fff;
  valign: middle;
  text-align: center;
  padding: 5px;
}

#button-bt {
  margin-left: 10px;
  float: left;
  height: 30px;
}

#clear-bt {
  margin-left: 10px;
  float: left;
  height: 30px;
}

#error-container {
  float: left;
}

#error {
  clear: both;
  margin-top: 20px;
  float: left;
}

body {
  font-family: Arial, Helvetica, sans-serif;

}


#article {
  padding:10% 10% 0;
}