JSFiddle - React, Tailwind, and code Playground

HTML

<div class="floatLeft">Activity</div>
<div class="floatRight font12 "><a href="javascript:void(0);">View timeline / Filter activities</a></div>

CSS

.floatLeft {
    border: 1px solid black;
    font-size: 30px;
    width: 200px;
    display: table-cell;
    vertical-align: text-bottom;
}
.floatRight {
    border: 1px solid black;
    font-size: 12px;
    display: table-cell;
    vertical-align: text-bottom;
    width: 200px;
}