JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div class="marker">SP</div>
</body>

CSS

body {
    background-image:url('http://estradas.com.br/paginas/mapa.png');
    background-repeat:no-repeat;
    background-size:cover;
    position:relative;
    min-height:400px;
    z-index:1;
}
.marker {
    position:absolute;
    display:inline-block;
    top:10px; right:20px;
    background:#000;
    color:#fff;
    z-index: 10;
}