style.css

/* All styling for Exchange Rate Calculator App */
html {
  position: relative;
  min-height: 100%;
  text-align: center;
}

body {
  margin: 20px;
  font-family: 'Open Sans', sans-serif;
}

header {
  margin: 50px 20px;
  font-weight: 800;
  font-size: 2em;
}

input {
  margin-right: 10px;
}

select {
  margin-right: 10px;
  cursor: pointer;
}

.error p {
  margin-top: 15px;
  margin-left: auto;
  margin-right: auto;
  color: red;
  border: 2px solid red;
  width: 300px;
}

form button {
  display: block;
  margin: 30px auto;
  height: 50px;
  width: 100px;
  font-size: 1.3em;
  background-color: black;
  color: white;
  cursor: pointer;
  border: none;
  border-radius: 10px;
}

#results {
  margin: 0 auto;
  border-top: 2px solid black;
  width: 65%;
}

#results div {
  margin: 30px auto;
  border: 2px solid black;
  width: 50%;
}

#exchdata table {
  margin: 30px auto;
  padding: 10px;
  border: 2px solid black;
  width: 50%;
}

footer {
  margin: 50px 20px;
  display: block;
  font-family: 'Open Sans';
  font-weight: lighter;
  font-style: italic;
}

.backToTop a {
  margin: 10px auto;
  display: block;
  font-size: 1.4em;
}