JSFiddle - React, Tailwind, and code Playground

HTML

<p>how to remove the top border?</p><br/>
<div> something </div>

CSS

body {
    background-color: #000;
}
div {
    position: relative;
    margin-top: 25px;
    color: #fff;
    height: 45px;
    margin-top: -5px;
    padding: 26px 24px 46px;
    font-weight: normal;
    background: #000; /*#fff;*/
    border-top: 0px solid #e5e5e5;
    border-left: 1px solid #e5e5e5;
    border-right: 1px solid #e5e5e5;
    border-bottom: 1px solid #e5e5e5;
    -webkit-border-radius: 3px;
     -khtml-border-radius: 3px;
       -moz-border-radius: 3px;
            border-radius: 3px;
}
div:before {
    content: "";
    position: absolute;
    z-index: -1;
    top: 5px;
    right: 0;
    bottom: 0;
    left: 0;
    
    -webkit-box-shadow: rgba(200,200,200,0.7) 0px 0px 10px 0px;
     -khtml-box-shadow: rgba(200,200,200,0.7) 0px 0px 10px 0px;
       -moz-box-shadow: rgba(200,200,200,0.7) 0px 0px 10px 0px;
            box-shadow: rgba(200,200,200,0.7) 0px 0px 10px 0px;
}
    
p {
    color: #fff;
}