.converter-wrapper {
  margin: 0 auto;
  width: 100%;
  max-width: 600px;
  text-align: center;
  padding: 10px;
  box-sizing: border-box;
}
.converter-wrapper input {
  font-family: 'Open Sans', sans-serif;
  font-size: 1em;
  width: 100%;
  text-align: center;
  margin-top: 10px;
  height: 40px;
  box-sizing: border-box;
}
.converter-wrapper span {
  position: relative;
  display: inline-block;
  vertical-align: middle;
  width: 100%;
}
.converter-wrapper span select {
  background-color: #3b5998;
  color: #fff;
  font-size: inherit;
  padding: 10px;
  width: 100%;
  border: 0;
  margin: 0;
  border-radius: 0px;
  text-indent: 0.01px;
  text-overflow: '';
}
.converter-side-a,
.converter-side-b {
  float: left;
  margin-top: 10px;
  box-sizing: border-box;
  width: 45%;
}
.converter-equals {
  float: left;
  box-sizing: border-box;
  width: 10%;
  font-size: 2.4em;
  line-height: 2.4em;
  text-align: center;
}
.converter-side-a {
  padding-right: 10px;
}
.converter-side-b {
  padding-left: 10px;
}