html, body {
  background: #f5f5f5;
  width: 100%;
  min-height: 100vh;
  margin: 0;
  padding: 0;
}

@media (width >= 768px) {
  body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    display: flex;
  }

  #root {
    background: #fff;
    border-radius: 20px;
    width: 390px;
    max-width: 390px;
    min-height: 700px;
    overflow: hidden;
    box-shadow: 0 10px 30px #0003;
    margin: 0 !important;
    position: fixed !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
  }
}

@media (width <= 767px) {
  html {
    height: 100dvh;
  }

  body {
    height: 100dvh;
    min-height: -webkit-fill-available;
  }

  #root {
    height: calc(var(--vh, 1vh) * 100);
    background: #fff;
    flex-direction: column;
    width: 100%;
    height: 100dvh;
    min-height: -webkit-fill-available;
    display: flex;
    overflow: hidden;
  }
}