body {
  background-image: url(./img/login_bg.png) !important;
  background-size: cover !important;
}

.heading {
  margin: 0 auto;
  padding-bottom: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.heading span {
  color: black;
  font-size: 25px;
}

.login-main {
  margin-top: 60%;
  padding: 30px 30px 0px 30px;
  width: 350px;
  height: 350px;
  border-radius: 10px;
  background-color: azure;
}

.login-btn {
  margin-top: 30px;
  padding-bottom: 10px;
}

.login-btn button {
  border-radius: 20px;
}

.login-btn button {
  font-size: 20px;
}

.foot {
  margin: 0 auto;
  text-align: center;
  color: aliceblue;
  position: fixed;
  bottom: 20px;
  left: 50%;
  /*向左偏移自身宽度一半*/
  transform: translateX(-50%);
}