html,
body {
  height: 80%;
}

body {  
  display: -ms-flexbox;
  display: flex;
  display: -ms-flex-align: center;
  align-items: center;
  padding-top: 80px;
  padding-bottom: 40px;
  background-color: #f5f5f5;
  background-image: url('../imagem/fundo.jpg');
  height: 450px; /* You must set a specified height */
  background-position: center; /* Center the image */
  background-repeat: no-repeat; /* Do not repeat the image */
  background-size: cover; /* Resize the background image to cover the entire container */
}

.form-signin {
  width: 100%;
  max-width: 250px;
  padding: 10px;
  margin: auto;  
  border-radius: 4px;
}

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

.form-label-group input,
.form-label-group label {
	text-align: center;
background: transparent;
 border-radius: 20px;
}
  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::-moz-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::placeholder {
  color: transparent;
}

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

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

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

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

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

.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 {
    display: -ms-flexbox;
    display: flex;
    display: -ms-flex-direction: column-reverse;
    flex-direction: column-reverse;
  }

  .form-label-group label {
    position: static;
  }

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