html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: transparent;
}

.wave {
    width: 100%;
    position: absolute;
    overflow: hidden;
    bottom: 0;
    z-index: 0;
}

.wave > svg {
    display: block;
}

.form-signin {
  width: 100%;
  max-width: 330px;
  padding: 15px;
  margin: auto;
  z-index: 1;
}

.form-signin .checkbox {
  font-weight: 400;
}

.form-signin .form-control:focus-within {
  z-index: 2;
}