body {
  margin: 0;
  padding: 0;
  font-family: ubuntu, arial;
  /*background: url(../img/imagem3.jpg);
    background-size: cover;*/
  background-color: black;
}

.box {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  padding: 40px;
  background: rgba(224, 223, 223, 0.137);
  box-sizing: border-box;
  box-shadow: 0 15px 25px rgba(255, 255, 255, 0.753);
  border-radius: 10px;
}

.box h2 {
  margin: 0 0 30px;
  padding: 0;
  color: #fff;
  text-align: center;
}

.box .inputbox {
  position: relative;
}

.box .inputbox input {
  width: 100%;
  padding: 10px 0;
  font-size: 16px;
  color: #fff;
  margin-bottom: 30px;
  border: none;
  border-bottom: 1px solid #fff;
  outline: none;
  background: transparent;
}

.box .inputbox label {
  position: absolute;
  top: 0;
  left: 0;
  padding: 10px 0;
  font-size: 16px;
  color: #fff;
  pointer-events: none;
  transition: 0.5s;
}

.box .inputbox input:focus ~ label,
.box .inputbox input:valid ~ label {
  top: -22px;
  left: 0;
  color: rgb(1, 94, 1);
  font-size: 14px;
}

.box .inputbox input:focus {
  transition: 0.5s;
  border-bottom: 2px solid rgb(1, 94, 1);
}

.box input[type="submit"] {
  background: transparent;
  border: none;
  outline: none;
  color: white;
  background: rgb(1, 94, 1);
  padding: 10px 20px;
  cursor: pointer;
  border-radius: 10px;
}

.back {
  position: absolute;
  color: white;
  font-size: 15px;
  margin-top: 25px;
  float: right;
  top: 70%;
  left: 70%;
}

a:visited {
  color: white;
}

a {
  color: white;
  text-decoration: none;
}

a:hover {
  color: white;
  text-decoration: none;
}