<div class="cp_tab">
	<input type="radio" name="cp_tab" id="tab2_1" aria-controls="first_tab02" checked>
	<label for="tab2_1">First Tab</label>
	<input type="radio" name="cp_tab" id="tab2_2" aria-controls="second_tab02">
	<label for="tab2_2">Second Tab</label>
	<input type="radio" name="cp_tab" id="tab2_3" aria-controls="third_tab02">
	<label for="tab2_3">Third Tab</label>
	<input type="radio" name="cp_tab" id="tab2_4" aria-controls="force_tab02">
	<label for="tab2_4">Force Tab</label>
	<div class="cp_tabpanels">
		<div class="cp_tabpanel">
		<h2>First Tab</h2>
		<p>First Tab text</p>
		</div>
		<div class="cp_tabpanel">
		<h2>Second Tab</h2>
		<p>Second Tab text</p>
		</div>
		<div class="cp_tabpanel">
		<h2>Third Tab</h2>
		<p>Third Tab text</p>
		</div>
		<div class="cp_tabpanel">
		<h2>Force Tab</h2>
		<p>Force Tab text</p>
		</div>
	</div>
</div>

.cp_tab *, .cp_tab *:before, .cp_tab *:after {
	-webkit-box-sizing: border-box;
	        box-sizing: border-box;
}
.cp_tab {
	margin: 1em auto;
	position: relative;
}
.cp_tab input[type='radio'] {
	margin: 0;
	padding: 0;
	border: none;
	border-radius: 0;
	outline: none;
	background: none;
	-webkit-appearance: none;
	        appearance: none;
	display: none;
}
.cp_tab .cp_tabpanel {
	display: none;
}
.cp_tab > input:first-child:checked ~ .cp_tabpanels > .cp_tabpanel:first-child,
.cp_tab > input:nth-child(3):checked ~ .cp_tabpanels > .cp_tabpanel:nth-child(2),
.cp_tab > input:nth-child(5):checked ~ .cp_tabpanels > .cp_tabpanel:nth-child(3),
.cp_tab > input:nth-child(7):checked ~ .cp_tabpanels > .cp_tabpanel:nth-child(4),
.cp_tab > input:nth-child(9):checked ~ .cp_tabpanels > .cp_tabpanel:nth-child(5),
.cp_tab > input:nth-child(11):checked ~ .cp_tabpanels > .cp_tabpanel:nth-child(6) {
	display: block;
}
.cp_tab .cp_tabpanels {
	position: absolute;
	top:0;
	left: 10em;
	display: block;
	height: 320px;
}
.cp_tab > input + label {
	position: relative;
	z-index: 100;
	top: -15px;
	left: 1px;
	display: block;
	width: 10em;
	margin-bottom: -20px;
	padding: 15px;
	cursor: pointer;
	border: 1px solid #cccccc;
	border-right: 0;
	border-radius: 6px 0 0 6px;
}
.cp_tab > input + label:last-of-type {
	margin-bottom: 100px;
}
.cp_tab > label:hover,
.cp_tab > input:focus + label {
	color: #0066cc;
}
.cp_tab > input:checked + label {
	border-color: #cccccc;
	border-right: 1px solid #ffffff;/*背景色と同じ*/
}
.cp_tab .cp_tabpanel {
	padding: 0.5em 1em;
	border-left: 1px solid #cccccc;
	min-height: 320px;
}
@media (max-width: 480px) {
	.cp_tab {
		width: 100%;
	}
	.cp_tab > input + label {
	font-size: 0.7em;
	}
	.cp_tab .cp_tabpanels {
	left: 7em;
	min-width: 7em;
	}
}