JSFiddle - React, Tailwind, and code Playground

HTML

<div class="mainmenu"> <span class="mainmenuitem">
        Item1
    </span><span class="mainmenuitem">
        Item2
    </span>

</div>

CSS

.mainmenu {
    height: 25px;
    padding-left: 15px;
}
.mainmenuitem {
    display: inline-block;
    height: 25px;
    line-height: 25px;
    background-color: #F1F2F3;
    text-align: center;
    padding-top: 0px;
    padding-bottom: 0px;
    padding-left: 5px;
    padding-right: 5px;
    margin-right: 1px;
    margin-left: 0px;
    display: inline-block;
    vertical-align: middle;
    color: #00537B;
}