Как сдлеать блоки с float одиноковой высоту в родителе

header  
	width: 100% 
	background-color: $accent 
	.slider  
		width: 100% 
		overflow-x: hidden 
		.slider_line 
			position: relative 
			left: 0 
			top: 0 
			overflow: hidden 
			width: 100% 
			height: 100% 
			transition: left 0.5s 
			.slider_slide 
				width: 33.33333% 
				padding: 100px 
				height: 100% 
				background-color: #1c1c1c 
				float: left 
				&:nth-child(1) 
				  background: linear-gradient(to right, #0f2652 0%, #571557 100%) 
				&:nth-child(2) 
					background: radial-gradient(to bottom, #571557 0%, #0f2652 100%) 
				&:nth-child(3) 
					background: linear-gradient(to left, #0f2652 0%, #571557 100%)

	<header> 
	<div class="slider"> 
		<div class="slider_line clearfix"> 
			<div class="slider_slide"> 
				<h2>Text #1</h1> 
				<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quo itaque, qui odit aut aspernatur.         Deleniti ea vitae esse numquam nihil, commodi magnam, harum, iure, eos non architecto veritatis             facere a.</p> 
			</div> 
			<div class="slider_slide"> 
				<h2>Text #2</h1> 
				<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. A iure mollitia magnam provident nihil, molestias quis nulla error? In atque nemo odit dolorem culpa perferendis maxime nulla consectetur sit dignissimos.</p> 
			</div> 
			<div class="slider_slide"> 
				<h2>Text #3</h1> 
				<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Obcaecati architecto reiciendis porro quis. Illo molestias numquam in quas cupiditate, sint. Ex a nostrum veniam, pariatur reprehenderit harum mollitia provident nemo.</p> 
			</div> 
		</div> 
	</div> 
	</header>

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print{.hidden-print{display:none!important}}*{-webkit-box-sizing:border-box;box-sizing:border-box}:after,:before{-webkit-box-sizing:border-box;box-sizing:border-box}::-webkit-input-placeholder{color:#666;opacity:1}:-moz-placeholder{color:#666;opacity:1}::-moz-placeholder{color:#666;opacity:1}:-ms-input-placeholder{color:#666;opacity:1}body input:focus:required:invalid,body textarea:focus:required:invalid{color:#666}body input:required:valid,body textarea:required:valid{color:#666}body,html{height:100%}body{font-size:16px;min-width:320px;position:relative;line-height:1.65;font-family:roboto-example,sans-serif;overflow-x:hidden;opacity:1}li,ul{list-style:none;padding:0;margin:0}#load{position:absolute;top:50%;left:50%;width:75px;height:75px;border:10px solid #fff;border-top:10px solid #182453;-webkit-border-radius:100%;border-radius:100%;-webkit-transform:translate(-50%,-50%);-ms-transform:translate(-50%,-50%);transform:translate(-50%,-50%);-webkit-animation:1s loading infinite linear;animation:1s loading infinite linear}header{width:100%;background-color:#1c1c1c}header .slider{width:100%;height:100%;overflow-x:hidden}header .slider .slider_line{position:relative;left:0;top:0;overflow:hidden;width:100%;height:100%;-webkit-transition:left .5s;-o-transition:left .5s;transition:left .5s}header .slider .slider_line .slider_slide{width:33.33333%;height:100%;padding:100px;background-color:#1c1c1c;float:left}header .slider .slider_line .slider_slide:nth-child(1){background:-webkit-gradient(linear,left top,right top,from(#0f2652),to(#571557));background:-webkit-linear-gradient(left,#0f2652 0,#571557 100%);background:-o-linear-gradient(left,#0f2652 0,#571557 100%);background:linear-gradient(to right,#0f2652 0,#571557 100%)}header .slider .slider_line .slider_slide:nth-child(2){background:-webkit-radial-gradient(top,#571557 0,#0f2652 100%);background:-o-radial-gradient(top,#571557 0,#0f2652 100%);background:radial-gradient(to bottom,#571557 0,#0f2652 100%)}header .slider .slider_line .slider_slide:nth-child(3){background:-webkit-gradient(linear,right top,left top,from(#0f2652),to(#571557));background:-webkit-linear-gradient(right,#0f2652 0,#571557 100%);background:-o-linear-gradient(right,#0f2652 0,#571557 100%);background:linear-gradient(to left,#0f2652 0,#571557 100%)}header .slider .slider_line .slider_slide h2{margin:0;text-align:center;line-height:1.15em;font-size:5em;color:#fff;text-shadow:1px 1px 5px #000}header .slider .slider_line .slider_slide p{text-align:center;font-size:1.65em;color:#fff;text-shadow:1px 1px 5px #000}@media only screen and (max-width:992px){header .slider .slider_line .slider_slide p{font-size:1.15em}}@media only screen and (max-width:768px){header{min-height:400px}header .slider .slider_line .slider_slide{padding:50px}header .slider .slider_line .slider_slide p{text-align:center;font-size:1.075em;color:#fff;text-shadow:1px 1px 5px #000}}@media only screen and (max-width:480px){header{min-height:550px}header .slider .slider_line .slider_slide{padding:35px}header .slider .slider_line .slider_slide h2{font-size:4em}header .slider .slider_line .slider_slide p{text-align:center;font-size:1.25em;color:#fff;text-shadow:1px 1px 5px #000}}@-webkit-keyframes loading{0%{-webkit-transform:translate(-50%,-50%) rotate(0);transform:translate(-50%,-50%) rotate(0)}100%{-webkit-transform:translate(-50%,-50%) rotate(360deg);transform:translate(-50%,-50%) rotate(360deg)}}@keyframes loading{0%{-webkit-transform:translate(-50%,-50%) rotate(0);transform:translate(-50%,-50%) rotate(0)}100%{-webkit-transform:translate(-50%,-50%) rotate(360deg);transform:translate(-50%,-50%) rotate(360deg)}}

	<header> 
	<div class="slider"> 
		<div class="slider_line clearfix"> 
			<div class="slider_slide"> 
				<h2>Text #1</h1> 
				<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quo itaque, qui odit aut aspernatur. Deleniti ea vitae esse numquam nihil, commodi magnam, harum, iure, eos non architecto veritatis facere a.</p> 
			</div> 
			<div class="slider_slide"> 
				<h2>Text #2</h1> 
				<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. A iure mollitia magnam provident nihil, molestias quis nulla error? In atque nemo odit dolorem culpa perferendis maxime nulla consectetur sit dignissimos.</p> 
			</div> 
			<div class="slider_slide"> 
				<h2>Text #3</h1> 
				<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Obcaecati architecto reiciendis porro quis. Illo molestias numquam in quas cupiditate, sint. Ex a nostrum veniam, pariatur reprehenderit harum mollitia provident nemo.</p> 
			</div> 
		</div> 
	</div> 
	</header>