JSFiddle - React, Tailwind, and code Playground

HTML

<div id="thinLinesInFirefox">testing</div>

CSS

body {
    background-color: red;
}

#thinLinesInFirefox {
    
    width: 200px;
    height: 200px;    

    margin-top: 50px;
    margin-left: 50px;
    
    background-color: #396E97;  

    -webkit-transform:rotate(4deg); /* Chrome and Safari */
    -moz-transform:rotate(4deg);    /* Firefox */    
    
    /* When the 4 sides are different there are cracks in border. */
    border-top:    105px;
    border-right:  110px;
    border-bottom: 115px;
    border-left:   120px;

    /* Define border-style before border-class per CSS rule. */    
    border-style: dashed;
    
    /* Define boder-color */
    border-color: black;
    


}
#thinLinesInFirefox:before {
    content: '';
    display: block;
    width: 201px;
    height: 201px;
    position: absolute;
    top: -105px;
    left: -120px;
    border-top:    104px;
    border-right:  110px;
    border-bottom: 115px;
    border-left:   119px;

    /* Define border-style before border-class per CSS rule. */    
    border-style: solid;
    
    /* Define boder-color */
    border-color: black;
    
    z-index: -1;
}