JSFiddle - React, Tailwind, and code Playground

HTML

<header>
    <div class="logoheader">
        <img class="mainlogo" src="logo.png" alt="logo">
    </div>
</header>

CSS

body {
    margin:0px;
}
.logoheader {
    height: 20vh;
    background:rgb(1, 1, 1);
    margin:0px;
    text-align: center;
    line-height: 20vh;
}
.mainlogo {
    max-height:90%;
}