html {zoom: 0.8; /* 80% */} 
body { height:100%; width:100%; margin:0; }

.login-body{
  min-height:100vh;
  width:100%;
  display:grid;
  place-items:center;        /* pion + poziom */
  background:#f5f7fb;
  -webkit-tap-highlight-color:transparent;
}
@supports (min-height:100dvh){
  .login-body{ min-height:100dvh; }
}

.login-box{
  width:100%;
  max-width:420px;
  margin:0;
  background:#fff;
  border-radius:14px;
  box-shadow:0 10px 30px rgba(0,0,0,.08);
  padding:24px;
  text-align:left;
}