body {
  background: url(img/1.png) no-repeat;
  background-size: cover;
}

.box{
  width: 300px;
  background-color: black;
  margin: 15% auto;
  padding: 50px;
  color: #fff;
  box-shadow: 0 0 20px 2px rgba(0, 0, 0, 0.5);
}

.input-box{
  margin: 10px auto;
  width: 100%;
  border-bottom: 1px solid #fff;
  padding-top: 5px;
  padding-bottom: 5px;
}

.input-box input {
  width: 90%;
  border: none;
  outline: none;
  background: transparent;
  color: #fff;
}

.hint {
  padding-top: 10px;
  opacity: 70%;
}