giaodien.css

body {
   background-image: url("./logo/bg.png");
   background-size: 100% 100%;
   background-attachment: fixed;
   color: green;


}
#clock{
	text-align: center;
	font: 20px;
	
}
#ngaythang {
	font-size: 40px;
	font-weight: bold;
	text-align: center;
}

#gio {
	font-size: 25px;
	font-weight: bold;
	text-align: center;
}

.hienthi {
	margin-top: 10%;
	position: center;
	text-align: center;
	font-size: 30px;
	
}

#thongbao {
	margin-top:7%;
	position: 0 0 1 0;
	font-size: 60px;
	font-weight: bold;
	text-align: center;
}

#dtnd {
	margin-top: 1px;
}
.collapsible{
	margin-top: 3%;
	text-align: center;
	background-color: green;
    color: white;
    cursor: pointer;
    padding: 18px;
	width: 100%;
    border: none;
    text-align: center;
    outline: none;
    font-size: 30px;
}
.content{
	position: absolute;
    left:0 ;
    top: 50%;
    width: 100%;
    text-align: center;
    font-size: 18px;
	margin-top: 25%;
}

.button_container {
    position: absolute;
  left: 0;
  right: 0;
  top: 30%;
}
 
.button_container p {
    font-family: 'Amatic SC', cursive;
    text-align: center;
    font-size: 35px;
}
 
.btn {
  border: none;
  display: block;
  text-align: center;
  cursor: pointer;
  text-transform: uppercase;
  outline: none;
  overflow: hidden;
  position: relative;
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  background-color: green;
  padding: 17px 60px;
  margin: 15px auto;
  box-shadow: 0 5px 15px rgba(0,0,0,0.20);
}
 
.btn span {
  position: relative; 
  z-index: 1;
}
 
.btn:after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 490%;
  width: 140%;
  background: #78c7d2;
  -webkit-transition: all .5s ease-in-out;
  transition: all .5s ease-in-out;
  -webkit-transform: translateX(-98%) translateY(-25%) rotate(45deg);
  transform: translateX(-98%) translateY(-25%) rotate(45deg);
}
 
.btn:hover:after {
  -webkit-transform: translateX(-9%) translateY(-25%) rotate(45deg);
  transform: translateX(-9%) translateY(-25%) rotate(45deg);
}