style.css

html {
  font-size: 62.5%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}

form {
  width: 450px;
  padding: 15px;
  border-radius: 5px;
  background: #fff;
  box-shadow: 5px 5px 10px 0 rgba(0, 0, 0, 0.05), -5px -5px 10px 0 rgba(0, 0, 0, 0.05);
  transition: box-shadow 0.2s;
}

form:hover,
form:focus {
    box-shadow: 5px 5px 10px 0 rgba(0, 0, 0, 0.08), -5px -5px 10px 0 rgba(0, 0, 0, 0.08);
}
form > div > label::after {
  content: ":";
}

form div {
  display: flex;
}

form > div {
  display: grid;
  grid-template-columns: 20% 1fr;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

label {
  text-transform: capitalize;
  font-size: 1.5rem;
  white-space: nowrap;
  justify-self: end;
}

input,
select,
textarea {
  outline: 0;
  padding: 0.7rem;
  border: 1px solid #ced4da;
  border-radius: 0.25rem;
}

input:focus,
select:focus,
textarea:focus {
  box-shadow: 0 0 0 0.25rem rgb(41 131 221 / 35%);
}

input[type="checkbox"],
input[type="radio"] {
  border: 0px;
  width: 18px;
  height: 18px;
  transform: translateY(-2px);
}

button {
  outline: 0;
  border: 1px solid #ced4da;
  border-radius: 0.25rem;
  padding: 1rem;
  text-transform: capitalize;
  font-size: 1.5rem;
  font-family: inherit;
  background: #fff;
  cursor: pointer;
}

select {
  font-family: inherit;
}

.form--title {
    display: block;
    font-size: 2.3rem;
    text-align: center;
    margin:0 0 25px 0;
}
.form-check {
  display: flex;
  margin-right: 5px;
  align-items: center;
  gap: 3px;
}
.btn-container {
  margin-top: 25px;
}
.btn--submit {
  border: 2px solid #2ab172;
  transition: background 0.2s, color 0.2s;
}

.btn--submit:hover {
  background: #2ab172;
  color: #fff;
}

.btn--reset {
  border: 2px solid #dc3545;
  transition: background 0.2s, color 0.2s;
}

.btn--reset:hover {
  background: #dc3545;
  color: #fff;
}

.invalid {
  box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25);
}

.valid {
  box-shadow: 0 0 0 0.25rem rgb(25 135 84 / 25%);
}

.error {
  font-size: 1.5rem;
  display: none;
  grid-column-start: 2;
  padding: 5px;
  border-radius: 0 0 5px 5px;
}

.error--active {
  display: block;
}

.error--invalid {
  color: #dc3545;
}