::-webkit-scrollbar-track {
	-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
	border-radius: 10px;
	background-color: #F5F5F5;
}
::-webkit-scrollbar {
	width: 15px;
	background-color: #F5F5F5;
}
::-webkit-scrollbar-thumb {
	border-radius: 10px;
	-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,.3);
	background-color: #555;
}
.dem-so-tu-so-ky-tu {
	font-family: Arial;
	font-size: 15px;
}
.dem-so-tu-so-ky-tu .main_dem {
	max-width: 500px;
    margin: 15px auto;
    border: 1px solid #ccc;
    padding: 20px;
    border-radius: 6px;
}
.dem-so-tu-so-ky-tu .title_dem {
	font-weight: bold;
	margin-bottom: 15px;
}
.dem-so-tu-so-ky-tu .dem_content {
	width: -moz-available;
	width: -webkit-fill-available;
	height: 250px;
	border-radius: 3px;
	padding: 15px;
	font-size: 15px;
}
.dem-so-tu-so-ky-tu .button_main {
	text-align: center;
	margin-top: 15px;
}
input[type=button],
input[type=submit] {
	background-color: #4CAF50;
	border: none;
	color: white;
	padding: 10px 15px;
	text-decoration: none;
	margin: 4px 2px;
	cursor: pointer;
	border-radius: 3px;
}
input[type=button] {
	background-color: #ccc;
}
input[type=button]:hover,
input[type=submit]:hover {
	opacity: .8;
}
.ketqua_dem {
	border: 1px solid #0d446b;
    padding: 15px;
    border-radius: 3px;
    background: #89b3ff;
    color: #052b45;
    font-size: 18px;
    margin-top: 15px;
}
.ketqua_dem p {
	margin-top: 0;
	margin-bottom: 15px;
}
.ketqua_dem span {
	font-weight: bold;
	font-size: 20px;
	color: white;
}