html {
  box-sizing: border-box;
  font-family: sans-serif;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

body {
  margin: 0;
}

.main {
  display: flex;
  width: 100%;
  min-height: 100vh;
  position: relative;
  justify-content: center;
  background: center/cover url(background.jpg);
  overflow: hidden;
}

.login-form {
  padding: 1rem;
  width: 15rem;
  position: absolute;
  top: calc(50% - 11rem);
  text-align: center;
  box-shadow: 0 0 0.5rem 0.01rem #5f1d1d;
  backdrop-filter: blur(3rem);
  opacity: 1;
  transition: top 1s ease-in-out, opacity 1s ease-in-out;
}

.hidden {
  top: 100%;
  opacity: 0;
}

.login-form > * {
  margin: 1rem 0;
}

.login-form legend {
  margin-bottom: 3rem;
  font-size: 1.5rem;
  font-weight: bold;
}

.input {
  padding: 0.5rem;
  border: none;
  outline: none;
  border-bottom: thin solid #ffffff;
  background-color: inherit;
}

.login-form > div {
  position: relative;
  height: 4rem;
}

.label {
  position: absolute;
  top: 0.5rem;
  left: 1rem;
  color: #00000080;
  font-size: 0.9rem;
  transition: top 0.3s ease-in-out, font-size 0.3s ease-in-out, color 0.3s ease-in-out;
  cursor: text;
}

.label-active {
  top: -1.5rem;
  color: #000000;
  font-size: 1rem;
}

button {
  padding: 0.5rem;
  width: 30%;
  font-size: 1rem;
  background-color: inherit;
  border: none;
  border-bottom: thin solid #00ffff;
  transition: width 0.3s ease-in-out;
  cursor: pointer;
}

button:hover {
  width: 100%;
}