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

/* Style the header */
header {
  background-color: #;
  padding: 2px;
  text-align: left;
  font-size: 10px;
  color: white;
}
<style>
body {font-family: Arial, Helvetica, sans-serif;}
* {box-sizing: border-box;}

.input-container {
  display: -ms-flexbox; /* IE10 */
  display: flex;
  width: 90%;
  margin-bottom: 15px;
}

.icon {
  padding: 10px;
  background: #0b5394;
  color: white;
  min-width: 50px;
  text-align: center;
}

.input-field {
  width: 90%;
  padding: 10px;
  outline: none;
}

.input-field:focus {
  border: 9px solid #0b5394;
}

/* Set a style for the submit button */
.btn {
  background-color: #0b5394;
  color: white;
  padding: 7px 2px;
  border: none;
  cursor: pointer;
  width: 35%;
  opacity: 0.7;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  margin: 2px 2px;
  cursor: pointer;
  border-radius: 4px;
  font-size: 15px;
}

.btn:hover {
  opacity: 1;
}

.footer {
   position: fixed;
   left: 0;
   bottom: 0;
   width: 100%;
   background-color: #1a1919;
   color: white;
   text-align: center;
   font-size: 12px;
   }