JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <div>
        <label class="propertyTitle">Hello:</label>
        <label class="propertyValue">World</label>
    </div>
    <div>
        <label class="propertyTitle">Goodbye:</label>
        <label class="propertyValue">To All of the People in the World</label>
    </div>
    <div>
        <label class="propertyTitle">I Want:</label>
        <label class="propertyValue">These labels to line up</label>
    </div>
</div>

CSS

.propertyTitle {
    text-transform: uppercase;
    width: 300px;/*Why doesn't this have any effect?*/
}
.propertyValue {
    text-align: left;
}