[jurvrn]

это к специалистам по css.

могу только гадать о вашем html.

вот. https://codepen.io/intersk/pen/gOmPJxW

.main-block {
        z-index: 1;
        position: fixed;
        width: 36px;
        height: 175px;
        top: 0;
        bottom: 0;
        margin: auto 0;
    }
    
    .each-block {
		position: relative;
        z-index: 2;
        display: flex;
        margin-bottom: 10px;
    }
    
    .iconka-block, .textLine-Out {
		height: 36px;
        border: black 2px solid;
        border-radius: 5px 0 0 5px;
		
    }
 
    .textLine-Out {
        z-index: 3;
        position: static;
		display: flex;
		background-color: rgb(213, 231, 248);
            -webkit-transition: transform 0.3s ease-in-out;
            -moz-transition: transform 0.3s ease-in-out;
            -o-transition: transform 0.3s ease-in-out;
            transition: transform 0.3s ease-in-out;
            -webkit-transform: translateX(0%);
            -moz-transform: translateX(0%);
            -ms-transform: translateX(0%);
            -o-transform: translateX(0%);
            transform: translateX(0%);
    }
	.textLine-Iner {
		margin: auto;
		font-size: 16px;
		white-space: nowrap;
        padding: 0 10px;
	}
    
    .iconka-block {
        position: absolute;
		display: flex;
        z-index: 4;
        background-color: rgb(226,226,226);
        width: 36px;
        right: 0;
        cursor: pointer;
        border-right: none;
    }
    
    .iconka-block:hover + .textLine-Out {
        -webkit-transform: translateX(calc(-100% + 4px));
        -moz-transform: translateX(calc(-100% + 4px));
        -ms-transform: translateX(calc(-100% + 4px));
        -o-transform: translateX(calc(-100% + 4px));
        transform: translateX(calc(-100% + 4px));
    }
    
    .iconka-block .icon_all {
        font-size: 22px;
        text-align: center;
		margin: auto;
    }

<div class="main-block">
    
        <div class="each-block">
            <div class="iconka-block"><i class="fa fa-envelope-o icon_all icon_mail" aria-hidden="true"></i></div>
            <div class="textLine-Out"><div class="textLine-Iner">Напишите нам</div></div>
        </div>
        
        <div class="each-block">
            <div class="iconka-block"><i class="fa fa-podcast icon_all icon_111_enter" aria-hidden="true"></i></div>
            <div class="textLine-Out"><div class="textLine-Iner">fa2-podcast 2icon</div></div>
        </div>
        
            <div class="each-block">
            <div class="iconka-block"><i class="fa fa-bookmark-o icon_all icon_111_enter" aria-hidden="true"></i></div>
            <div class="textLine-Out"><div class="textLine-Iner">33icon_fa-bookmark-o</div></div>
        </div>
        
        <div class="each-block">
            <div class="iconka-block"><i class="fa fa-user-circle icon_all icon_enter" aria-hidden="true"></i></div>
            <div class="textLine-Out"><div class="textLine-Iner">Вход на сайт</div></div>
        </div>
        
    </div>