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

html,
body {
    height: 100%;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
}

#container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-top: 15px;
}

h1 {
    padding: 10px;
    margin: 5px;
}

#btn {
    border-radius: 10px;
    font-size: 15px;
    padding: 10px 15px;
    background-color: rgb(227, 248, 255);
    font-weight: bold;
    border: 1px solid rgb(105, 197, 255);
}

    #btn:hover {
        background-color: rgb(23, 152, 233);
    }