@font-face {
  font-family: 'Noto Sans TC';
  font-style: normal;
  font-weight: 400;
  src: url(https://fonts.gstatic.com/s/notosanstc/v26/-nF7OG829Oofr2wohFbTp9iFOkMQAewlpbGXhhyYs0QF3kPVyLylzU95vTq1Ltj5xQez1g.0.woff2) format('woff2');
  unicode-range: U+1f921-1f930, U+1f932-1f935, U+1f937-1f939, U+1f940-1f944, U+1f947-1f94a, U+1f950-1f95f, U+1f962-1f967, U+1f969-1f96a, U+1f980-1f981, U+1f984-1f98d, U+1f990-1f992, U+1f994-1f996, U+1f9c0, U+1f9d0, U+1f9d2, U+1f9d4, U+1f9d6, U+1f9d8, U+1f9da, U+1f9dc-1f9dd, U+1f9df-1f9e2, U+1f9e5-1f9e6, U+20024, U+20487, U+20779, U+20c41, U+20c78, U+20d71, U+20e98, U+20ef9, U+2107b, U+210c1, U+22c51, U+233b4, U+24a12, U+2512b, U+2546e, U+25683, U+267cc, U+269f2, U+27657, U+282e2, U+2898d, U+29d5a, U+f0001-f0005, U+f0019, U+f009b, U+f0101-f0104, U+f012b, U+f01ba, U+f01d6, U+f0209, U+f0217, U+f0223-f0224, U+fc355, U+fe327, U+fe517, U+feb97, U+fffb4;
}

html {
  font-family: Arial, Noto Sans TC;
  overflow: hidden;
  background-image: url("bg.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: top center;
  height: 110%;
  width: 100%;
}

h1{
  text-shadow: none;
  color: #009879;
}

h3{
  margin-top:-20px;
  text-shadow: none;
  color: #003f33;
}

.loginbtn {
  padding: 18px 26px;
  font-size: 20px;
  background-color: #008cba;
  color: white;
  border: none;
  cursor: pointer;
  border-radius: 15px 15px 15px 15px;
  margin-top: 40px;
}

.loginbtn:hover {
  background-color: #007e96;
}

.backbtn {
  display: none;
  padding: 12px 15px;
  background-color: #009879;
  color: white;
  border: none;
  cursor: pointer;
  border-radius: 15px 15px 15px 15px;
}

.screen {
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 90%;
  width: 100%;
}

.display {
  display: flex;
  justify-content: center;
  height: 300px;
  width: 400px;
  text-shadow: 2px 4px 3px rgba(0, 0, 0, 0.3);
  border-radius: 10px 10px 10px 10px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.35);
  text-align: center;
  background-color: whitesmoke;
}

.msg{
  color: red;
}