JSFiddle - React, Tailwind, and code Playground

HTML

<div class='container'>

    <div>some line with text</div>
    <div>another line with text</div>    

    <div class='button-wrapper'>
        <input type="button" value="submit"  />
    </div>

</div>

CSS

.container {
    background: bisque;
    display: table;
    width:100%;
}
    
input[type=button] {    
    vertical-align: middle;
    display: block;
    width: 50%;
    margin: 0 auto;
}
    
.button-wrapper {
    background: chocolate;
    display: table-cell;
    vertical-align: middle;
}