:root {
  --font: bold 20px Trebuchet MS, Helvetica, sans-serif;
  --reg: #E18001;
  --login: #007504;
  --logout: #75004A;
}

* { box-sizing: border-box }

html { font: var(--font) }

body {
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: #FFEBD5;
}

button, .btn {
  font: var(--font);
  margin: 1.25rem 0;
  padding: .5rem;
  min-width: 15rem;
  border-radius: .3rem;
  color: white;
  text-decoration: none;
  text-align: center;
  display: inline-block;
  border: 0;
  cursor: pointer;
}
#regBtn    { background: var(--reg)    }
#loginBtn  { background: var(--login)  }
#logoutBtn { background: var(--logout) }

form {
  display: grid;
  grid-template-columns: auto auto;
  gap: 1rem;
  justify-items: center;
  align-items: center;
}

label {
  justify-self: right;
}

input {
  font: var(--font);
  text-align: center;
  height: 2rem;
  width: 20rem;
  border-radius: .3rem;
  border: 2px solid lightgray;
}

#alertbox {
  display: none;
  min-height: 5rem;
  background: #ACE3AE;
  position: fixed;
  top:0;
  width: 100%;
}

#informer {
  margin: auto;
  color: var(--login);
  text-align: center;
}

#language {
  font: var(--font);
  position: fixed;
  top:0;
  right:0;
  margin: .5rem;
  border-radius: .3rem;
  border: 2px solid lightgray;
}