style.css

* {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
}

:root{
    --primary-color: white;
    --secondary-color: #0f0c27;
}

.dark-theme{
    --primary-color:#0f0c27;
    --secondary-color:#white;
}

body{
    background: var(--secondary-color);
}

.container {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-color);
    padding: 10px 20px;
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#icon{
    cursor: pointer;
    width: 15px;
    padding: 20px;
}

#modeText{
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    color: white;
}

body.dark-theme #modeText {
    color: #0f0c27;
}