@charset "utf-8";

*, *::before, *::after {
	box-sizing: border-box;
}

body {
	font-family: Arial, Helvetica, "微軟正黑體", sans-serif;
	background-color: #eee;
}

p {
	line-height: 1.6;
}

.tab {
	width: 700px;
	margin-left: auto;
	margin-right: auto;
}

.tab__ls {
	padding: 0;
	margin: 0;
	list-style-type: none;
	display: flex;
}

.tab__item {
	width: 20%;
	text-align: center;
	line-height: 2.5;
	color: #999;
	background-color: #eee;
	border: solid 1px #ccc;
	border-width: 1px 0;
	cursor: pointer;
}

.tab__item:hover {
	color: #000;
}

.tab__item:first-child {
	border-left: solid 1px #ccc;
}

.tab__item:last-child {
	border-right: solid 1px #ccc;
}

.tab__item--active {
	position: relative;
	color: #000;
	background-color: #fff;
	border-bottom-color: #fff;
	border-left: solid 1px #ccc;
	border-right: solid 1px #ccc;
}

.tab__item--active::before {
	content: "";
	position: absolute;
	top: -1px;
	left: 0;
	height: 3px;
	width: 100%;
	background-color: red;
}

.tab__content {
	background-color: #fff;
	border: solid 1px #ccc;
	border-top-color: transparent;
}

.tab__desc {
	margin: 15px;
}