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: .75rem;
}

.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;
   pointer-events: none;
   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 {
   color: transparent;
}

.form-label-group input:not(:placeholder-shown) {
   padding-top: 1.25rem;
   padding-bottom: .25rem;
}

.form-label-group input:not(:placeholder-shown) ~ label {
   padding-top: .25rem;
   padding-bottom: .25rem;
   font-size: 12px;
   color: #777;
}

/* Fallback for Edge
-------------------------------------------------- */
@supports (-ms-ime-align: auto) {
   .form-label-group > label {
      display: none;
   }

   .form-label-group input::-ms-input-placeholder {
      color: #777;
   }
}

/* Fallback for IE
-------------------------------------------------- */
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
   .form-label-group > label {
      display: none;
   }

   .form-label-group input:-ms-input-placeholder {
      color: #777;
   }
}