JSFiddle - React, Tailwind, and code Playground

HTML

<a class="cal-button" style="background-color:SteelBlue"><span>SteelBlue</span></a>

<a class="cal-button" style="background-color:Sienna"><span>Sienna</span></a>

<a class="cal-button" style="background-color:DarkViolet"><span>DarkViolet</span></a>

CSS

/*  Custom Event Buttons for Calendar  */
.cal-button
{
    width: 100px;
    text-decoration: none;
    font: bold;
    display: inline-block;
    text-align: center;
    color: #fff;
    
    border: 1px solid #9c9c9c; /* Fallback style */
    border: 1px solid rgba(0, 0, 0, 0.3);
    text-shadow: 0 1px 0 rgba(0,0,0,0.4);
}
.cal-button span
{
    padding:3px;
    border-top: 1px solid #fff; /* Fallback style */
    border-top: 1px solid rgba(255, 255, 255, 0.5);
    display: block;
    color: #fff;
    
    background-image: -moz-linear-gradient(top,  rgba(255,255,255,0.08) 0%, rgba(252,252,252,0.08) 1%, rgba(183,183,183,0) 28%, rgba(0,0,0,0.15) 100%); /* FF3.6+ */
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,0.08)), color-stop(1%,rgba(252,252,252,0.08)), color-stop(28%,rgba(183,183,183,0)), color-stop(100%,rgba(0,0,0,0.15))); /* Chrome,Safari4+ */
    background-image: -webkit-linear-gradient(top,  rgba(255,255,255,0.08) 0%,rgba(252,252,252,0.08) 1%,rgba(183,183,183,0) 28%,rgba(0,0,0,0.15) 100%); /* Chrome10+,Safari5.1+ */
    background-image: -o-linear-gradient(top,  rgba(255,255,255,0.08) 0%,rgba(252,252,252,0.08) 1%,rgba(183,183,183,0) 28%,rgba(0,0,0,0.15) 100%); /* Opera 11.10+ */
    background-image: -ms-linear-gradient(top,  rgba(255,255,255,0.08) 0%,rgba(252,252,252,0.08) 1%,rgba(183,183,183,0) 28%,rgba(0,0,0,0.15) 100%); /* IE10+ */
    background-image: linear-gradient(to bottom,  rgba(255,255,255,0.08) 0%,rgba(252,252,252,0.08) 1%,rgba(183,183,183,0) 28%,rgba(0,0,0,0.15) 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#14ffffff', endColorstr='#26000000',GradientType=0 ); /* IE6-9 */
}
.cal-button:hover
{
    background-image: -moz-linear-gradient(top,  rgba(0,0,0,0.1) 0%, rgba(82,82,82,0.1) 32%, rgba(255,255,255,0.19) 100%); /* FF3.6+ */
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0,0,0,0.1)),...