Удаление изображений за слайдером

document.getElementById('slider-left').onclick = sliderLeft; 
document.getElementById('slider-right').onclick = sliderRight; 
var left = 0; 
var polosa = document.getElementById('polosa'); 
 
function sliderLeft() { 
	left = left - 128; 
	if (left < -512) { 
		left = 0; 
	} 
	polosa.style.left = left + 'px'; 
} 
 
function sliderRight() { 
	left = left + 128; 
	if (left > 0) { 
		left = -512; 
	} 
	polosa.style.left = left  + 'px'; 
}

.slider__content { 
	position: relative; 
	width: 500px; 
	margin: 0 auto; 
} 
.slider { 
	width: 128px; 
	height: 128px; 
	border: 5px solid  green; 
	margin: 50px auto; 
	overflow: hidden; 
} 
.polosa { 
	background: pink; 
	width: 896px; 
	position: relative; 
	transition: all .5s; 
	left: 0; 
} 
.polosa img { 
	float: left; 
} 
.polosa::after { 
	content: ''; 
	display: block; 
	clear: both; 
} 
button { 
	position: absolute; 
	background-color: pink; 
	outline: none; 
	padding: 8px 0; 
	border-radius: 6px; 
	font-size: 18px; 
	font-weight: 600; 
	border: 4px solid  green; 
	cursor: pointer; 
	top: 36%; 
	width: 80px; 
} 
.left { 
	left: 23%; 
} 
.right { 
	right: 23%; 
}

<div class="slider__content"> 
	<div class="slider" id="slider"> 
		<div class="polosa" id="polosa"> 
			<img src="http://download.seaicons.com/icons/mattahan/ultrabuuf/128/Comics-Hulk-Fist-icon.png" alt=""> 
			<img src="http://download.seaicons.com/icons/mattahan/ultrabuuf/128/Comics-Ironman-Red-icon.png" alt=""> 
			<img src="http://download.seaicons.com/icons/mattahan/ultrabuuf/128/Comics-Ironman-Hand-icon.png" alt=""> 
			<img src="http://icons.iconarchive.com/icons/mattahan/ultrabuuf/128/TV-Kitty-icon.png" alt=""> 
			<img src="https://cdn1.iconfinder.com/data/icons/UltraBuuf/128/A_Young_Leo.png" alt=""> 
			<img src="https://cdn1.iconfinder.com/data/icons/UltraBuuf/128/War_Machine.png" alt=""> 
			<img src="https://cdn1.iconfinder.com/data/icons/UltraBuuf/128/Thor.png" alt=""> 
		</div> 
	</div> 
 
	<button class="left" id="slider-left">Left</button> 
	<button class="right" id="slider-right">Right</button> 
</div>