JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block">
    <div class="block-inner">
        <button class="btn">
            Кнопка
            <div class="block-pos">
                Блок position: absolute;
            </div>
        </button>
        <button class="btn">
            Кнопка
            <div class="block-pos">
                Блок position: absolute;
            </div>
        </button>
        
                <button class="btn">
            Кнопка
            <div class="block-pos">
                Блок position: absolute;
            </div>
        </button>
        
                <button class="btn">
            Кнопка
            <div class="block-pos">
                Блок position: absolute;
            </div>
        </button>
        
    </div>
</div>

CSS

.block {
    width: 500px;
    margin: 0 auto;
    border: 1px solid #ccc;
    padding: 20px;
}

.btn {
    width: 100%;
    margin-bottom: 20px;
    position: relative;
}
.block-pos {
    background-color: #ccc;
    position: absolute;
    top: 0;
    left: 0;
    display: none;
    height: 150px;
    width: 100%;
    z-index: 2;
    pointer-events:none;
}
.btn:hover .block-pos {
    display: block;
}