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Fixed at side

HTML

<!-- Fixed at the middle of left side -->
<div class="fixed-at-side fixed-at-side--l">...</div>

<!-- Fixed at the middle of right side -->
<div class="fixed-at-side fixed-at-side--r">...</div>

CSS

.fixed-at-side {
position: fixed;
top: 50%;
transform: translate(0px, -50%);
}
.fixed-at-side--l {
left: 0;
}
.fixed-at-side--r {
right: 0;
}
Demo
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