JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Relaxer App</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="wrapper">
        <nav class="header">
            <div class="header__row">
                <h1 class="header__title">
                    Relaxer
                </h1>
            </div>
        </nav>
        <div class="content">
            <div class="circle">
                <div class="circle__row">
                   <div class="circle__border">
                    <div class="circle__block">Breathe In!</div>
                    <div class="circle__absolute"></div>
                   </div>
                </div>
            </div>
        </div>
    </div>
    <script src="script.js"></script>
</body>
</html>

CSS

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #224941;
    color: white;
}

.wrapper {
    min-height: 100vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
}
.header__row {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 25px 0;
}
.header__title {
    font-size: 30px;
}

.content {
    flex: 1 1 auto;
    margin: 30px 0 0 0;
    display: flex;
    justify-content: center;
    align-items: center;
}
.circle__row {
    flex: 1 1 auto;
    display: flex;
    justify-content: center;
    align-items: center;
}
.circle__border {
    border-right: 10px solid white;
    border-radius: 50%;
    border-bottom: 10px solid green;
    border-left: 10px solid blue;
}
.circle__block {
    width: 300px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #010f1c;
    border-radius: 50%;
    font-size: 17px;
}
.circle__absolute {
    width: 20px;
    height: 20px;
    background-color: #fff;
    position: absolute;
    border-radius: 50%;
}