* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

h3 {
  font-size: 18px;
  text-align: center;
  text-transform: uppercase;
}

#container {
  background: #e0e0e0;
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

#container form {
  background: #ccc;
  width: 500px;
  padding: 10px;
}

#container form img {
  margin: 15px auto;
  text-align: center;
  display: block;
}

#container form input {
  width: 90%;
  padding: 20px;
  font-size: 16px;
  display: block;
  margin: 25px auto;
  border-radius: 5px;
  border: 1px solid #fff;
  text-align: center;
}

#container form input[type="submit"] {
  cursor: pointer;
}

.alert {
  text-align: center;
  font-size: 16px;
}