style.css

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

body {
  height: 100vh;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #f3533b;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

form {
  background-color: #fa9f42;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
  max-width: 450px;
  height: 200px;
  padding: 10px;
  border: 1px solid black;
  border-radius: 10px;
}

form h4 {
  align-self: end;
  padding: 0 10px;
}

form h1 {
  padding: 0 10px;
  margin: 0 10px;
}

form input {
  border: 1px solid black;
  outline: none;
  background-color: #8dd67a;
  width: 90%;
  margin: 0 10px;
  padding: 8px 5px;
}

form input::placeholder {
  color: black;
  font-family: Verdana, Geneva, Tahoma, sans-serif;

}

.btn {
  width: 90%;
  margin: 0 10px;
  background-color: #5acec9;
  padding: 5px;
  border: 1px solid black;
  cursor: pointer;
  font-family: Verdana, Geneva, Tahoma, sans-serif;

}

.btn:hover {
  filter: brightness(0.9);
}