React Clima API

index.css

body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}
nav .brand-logo {
  display: block;
  text-align: center;
  position: relative;
}
.input-field label {
  color: white;
}

.input-field input[type=text]:focus + label {
  color: white;
} 

.input-field input[type=text]:focus {
  border-bottom: 1px solid white;
  box-shadow: 0 1px 0 0 #000;
}

input[type=text]:not(.browser-default) {
  border-bottom: 1px solid white;
  color: white;
}
input[type=text]:not(.browser-default):focus:not([readonly]) {
  border-bottom: 1px solid white;
  -webkit-box-shadow: 0 1px 0 0 white;
  box-shadow: 0 1px 0 0 white;
}
input[type=text]:not(.browser-default):focus:not([readonly]) + label {
  color: white;
}

.contenedor-form {
  padding: 3rem 0 1px 0;
  background-color: #03a9f4;
}
.buscador i {
  width: 100%;
}
.error {
  padding: 1rem!important;
  color:white;
  margin-top: 3rem;
  text-align: center;
}
.card-panel h2 {
  font-size: 1.6rem;
  text-align: center;
}
.card-panel p {
  text-align: center;
  font-size: 1.4rem;
}
.temperatura {
  font-size: 4rem!important
}
.temperatura span {
  font-size: 2rem!important;
  vertical-align: super;
}
.btn-block {
  display: block!important;
}

index.html

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">




<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0-rc.2/js/materialize.min.js"></script>
<script>
  document.addEventListener('DOMContentLoaded', function() {
      var elementos = document.querySelectorAll('select');
     M.FormSelect.init(elementos);
  });
</script>