<label class="inputFile">
  <span class="inputFile-custom"></span>
  <input type="file" id="file">
</label>

.inputFile {
  position: relative;
  display: inline-block;
  cursor: pointer;
  height: 1.5rem;
}

.inputFile input {
  margin: 0;
  filter: alpha(opacity=0);
  opacity: 0;
}

.inputFile-custom {
  text-align: left;
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  z-index: 5;
  height: 1.5rem;
  padding: .5rem 1rem;
  line-height: 1.5;
  color: #444;
  background-color: #f1f1f1;
  border: 1px solid #ddd;
  border-radius: 3px;
  box-shadow: inset 0 .5px .5px rgba(0, 0, 0, .05);
  user-select: none;
}

.inputFile-custom:before {
  position: absolute;
  top: -1px;
  right: -1px;
  bottom: -1px;
  z-index: 6;
  display: block;
  content: "Browse";
  height: 1.5rem;
  padding: .5rem 1rem;
  line-height: 1.5;
  color: #f1f1f1;
  background-color: #333;
  border: 1px solid #333;
  border-radius: 0 3px 3px 0;
}

.inputFile-custom:after {
  content: "Choose file...";
}


/* env styles */

body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: #f9f9f9;
}