outform.css

.container {
  background-color: var(--t-dark);
  padding: 15px;
  border-radius: 3px;
}

.f-message {
  font-style: oblique;
}

h1 {
  text-align: center;
}

form {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: min(90vw, 400px);
}

input {
  font-family: Roboto;
  font-size: 16px;
  border-radius: 3px;
  padding: 17px;
  background-color: var(--t-dark);
  border: 1px solid black;
  color: #eee;
  transition: background 0.3s;
}
.field:hover {
  background-color: var(--t-darker);
}
.field:focus,
.field:active {
  background-color: rgba(30, 30, 30, 0.5);
  border: 1px solid grey;
}

label {
  text-transform: uppercase;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 1px;
}

.field-error {
  font-style: oblique;
  color: var(--red);
  font-size: 0.9rem;
}

[type="submit"] {
  background-color: var(--red);
  border: none;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}

[type="submit"]:hover {
  background-color: var(--dark-red);
  cursor: pointer;
}

label,
[type="submit"] {
  margin-top: 10px;
}