html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  /*background-color: #f5f5f5;*/
  background: url(media/rz.jpg);
  height: 100%;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  position: relative;
}

.form-signin {
  width: 100%;
  max-width: 330px;
  padding: 15px;
  margin: auto;
  margin-top: 3%;
}

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

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

.form-signin input[type="email"] {
  margin-bottom: -1px;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}

.form-signin input[type="password"] {
  margin-bottom: 10px;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}

form {
    background-color: white;
    padding: 15px;
    border: 10px solid #8379b9;
    border-radius: 5px;
}

#signinbtn {
    background-color:#8379b9;
}