unitconvertor.css

h1{

    text-align: center;
    
}

*{
    margin:0;
    padding:0;
    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;
  border-radius: 0px !important;
}

.converter-wrapper span {
  position: relative;
  display: inline-block;
  vertical-align: middle;
  width: 100%;
}

.converter-wrapper span select {
  background-color: var(--blue);
  color: #fff;
  font-size: inherit;
  padding: 10px;
  width: 100%;
  border: 0;
  margin: 0;
  border-radius: 0px;
  text-indent: 0.01px;
  text-overflow: '';
  
}

.converter-wrapper span::before,
.converter-wrapper span::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.converter-wrapper span::after { /*  Custom dropdown arrow */
  content: "\25BC";
  height: 1em;
  font-size: .625em;
  line-height: 1;
  right: 1.5em;
  top: 50%;
  margin-top: -.5em;
  color: #fff;
}

.converter-wrapper span::before { /*  Custom dropdown arrow cover */
  width: 2.5em;
  right: 0;
  top: 0;
  bottom: 0;
  border-radius: 0;
  background-color: var(--blue);
}

.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%;
    color: #007bff;
    font-size: 2.4em;
    line-height: 0;
    text-align: center;
    padding-top: 60px;
    text-align: center !important;
    padding-left: 10px;
}

.converter-side-a {
  padding-right: 10px;
}

.converter-side-b {
  padding-left: 10px;
}