style.css

body {
  background-color: beige;
}

h1 {
  color: cornflowerblue;
  transition: color 0.5s ease-in-out;
}
.active {
  color: tomato;
}

.hidden {
  display: none;
}
img {
  top: 0;
  left: 0;
  height: 100vh;
  width: 100%;
  position: absolute;
  z-index: -1;
}
#background {
  display: flex;
  flex-direction: column;
  height: 100vh;
  justify-content: center;
  align-items: center;
}
#login-form input,
button {
  opacity: 1;
  border-radius: 20px;
}
#todo-form input {
  border-radius: 20px;
}
#login-form button {
  background: linear-gradient(to left, rgb(255, 77, 46), rgb(255, 155, 47));
}
input::placeholder {
  opacity: 1;
  color: aqua;
}
input {
  background-color: transparent;
  border-color: aqua;
  width: 200px;
  height: 35px;
}
#quote {
  font-size: 20px;
  font-weight: bold;
  color: aqua;
}
#login-form {
  position: relative;
  left: 28px;
}