floating-labels.css

:root {
  --input-padding-x: .75rem;
  --input-padding-y: .75rem;
}

html,
body {
  height: 100%;
}

body {
  display: -ms-flexbox;
  display: flex;
  -ms-flex-align: center;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #f5f5f5;
}

.form-signin {
  width: 100%;
  max-width: 420px;
  padding: 15px;
  margin: auto;
}

.form-label-group {
  position: relative;
  margin-bottom: 1rem;
}

.form-label-group > input,
.form-label-group > label {
  height: 3.125rem;
  padding: var(--input-padding-y) var(--input-padding-x);
}

.form-label-group > label {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: 100%;
  margin-bottom: 0; /* Override default `<label>` margin */
  line-height: 1.5;
  color: #495057;
  cursor: text; /* Match the input under the label */
  border: 1px solid transparent;
  border-radius: .25rem;
  transition: all .1s ease-in-out;
}

.form-label-group input::-webkit-input-placeholder {
  color: transparent;
}

.form-label-group input:-ms-input-placeholder {
  color: transparent;
}

.form-label-group input::-ms-input-placeholder {
  color: transparent;
}

.form-label-group input::-moz-placeholder {
  color: transparent;
}

.form-label-group input::placeholder {