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HTML 

              
                <div id="unsubscribe">
    <div class="letter">
        <div class="shadow"></div>
        <div class="background"></div>
        <div class="body">
            <div class="game idle">

                <div class="headline">
                    <span>Win Ping Pong to unsubscribe</span>
                    <div class="close">
                        <svg viewBox="0 0 24 24">
                            <path d="M19.7,4.3c-0.4-0.4-1-0.4-1.4,0L12,10.6L5.7,4.3c-0.4-0.4-1-0.4-1.4,0s-0.4,1,0,1.4l6.3,6.3l-6.3,6.3 c-0.4,0.4-0.4,1,0,1.4C4.5,19.9,4.7,20,5,20s0.5-0.1,0.7-0.3l6.3-6.3l6.3,6.3c0.2,0.2,0.5,0.3,0.7,0.3s0.5-0.1,0.7-0.3 c0.4-0.4,0.4-1,0-1.4L13.4,12l6.3-6.3C20.1,5.3,20.1,4.7,19.7,4.3z"></path>
                        </svg>
                    </div>
                </div>

                <div class="paddle one"></div>
                <div class="ball"></div>
                <div class="paddle two"></div>

                <div class="controls">
                    <span>Use <strong>up</strong> &amp; <strong>down</strong> arrow keys or</span>
                    <div>
                        <button class="up">
                            <svg viewBox="0 0 24 24">
                                <path d="M5.23 10.64a1 1 0 0 0 1.41.13L11 7.14V19a1 1 0 0 0 2 0V7.14l4.36 3.63a1 1 0 1 0 1.28-1.54l-6-5-.15-.09-.13-.07a1 1 0 0 0-.72 0l-.13.07-.15.09-6 5a1 1 0 0 0-.13 1.41z"></path>
                            </svg>
                        </button>
                        <button class="down">
                            <svg viewBox="0 0 24 24">
                                <path d="M18.77 13.36a1 1 0 0 0-1.41-.13L13 16.86V5a1 1 0 0 0-2 0v11.86l-4.36-3.63a1 1 0 1 0-1.28 1.54l6 5 .15.09.13.07a1 1 0 0 0 .72 0l.13-.07.15-.09 6-5a1 1 0 0 0 .13-1.41z">
                            </svg>
                        </button>
                    </div>
                </div>

                <div class="start">
                    <button>Start</button>
                    <small>or press up/down key</small>
                </div>

            </div>
        </div>
    </div>
    <h1>Unsubscribe</h1>
    <p>We are sorry to see you go!</p>
    <div class="cta">
        <button class="confirm">
            Confirm
        </button>
    </div>
</div>
    
<a class="twitter" target="_blank" href="https://twitter.com/aaroniker_me"><svg xmlns="http://www.w3.org/2000/svg" width="72" height="72" viewBox="0 0 72 72"><path d="M67.812 16.141a26.246 26.246 0 0 1-7.519 2.06 13.134 13.134 0 0 0 5.756-7.244 26.127 26.127 0 0 1-8.313 3.176A13.075 13.075 0 0 0 48.182 10c-7.229 0-13.092 5.861-13.092 13.093 0 1.026.118 2.021.338 2.981-10.885-.548-20.528-5.757-26.987-13.679a13.048 13.048 0 0 0-1.771 6.581c0 4.542 2.312 8.551 5.824 10.898a13.048 13.048 0 0 1-5.93-1.638c-.002.055-.002.11-.002.162 0 6.345 4.513 11.638 10.504 12.84a13.177 13.177 0 0 1-3.449.457c-.846 0-1.667-.078-2.465-.231 1.667 5.2 6.499 8.986 12.23 9.09a26.276 26.276 0 0 1-16.26 5.606A26.21 26.21 0 0 1 4 55.976a37.036 37.036 0 0 0 20.067 5.882c24.083 0 37.251-19.949 37.251-37.249 0-.566-.014-1.134-.039-1.694a26.597 26.597 0 0 0 6.533-6.774z"></path></svg></a>
!

CSS 

              
                :root {
    --text-color: #646B8C;
    --headline-color: #2B3044;
    --mail: #555B77;
    --mail-triangle: #494F69;
    --mail-background: #404660;
    --mail-shadow: #D1D6EE;
    --paper: #fff;
    --paper-border: #D1D6EE;
    --confirm-color: #fff;
    --confirm-background: #275EFE;
    --game-paddle: #404660;
    --game-ball: #275EFE;
    --controls-text: #646B8C;
    --controls-icon: #646B8C;
    --controls-background: #E1E6F9;
}

#unsubscribe,
#game {
    button {
        outline: none;
        border: none;
        display: table;
        margin: 0 auto;
        font-size: 14px;
        font-weight: 500;
        font-family: inherit;
        padding: 8px 20px;
        line-height: 21px;
        border-radius: 7px;
        cursor: pointer;
        -webkit-appearance: none;
        -webkit-tap-highlight-color: transparent;
    }
}

#unsubscribe {
    .letter {
        width: 84px;
        height: 72px;
        margin: 0 auto 32px auto;
        position: relative;
        animation: letter 2s ease infinite;
        &:before,
        &:after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 48px;
            z-index: 1;
        }
        &:before {
            background: var(--mail);
            clip-path: polygon(0 0, 50% 55%, 100% 0, 100% 100%, 0 100%);
        }
        &:after {
            background: var(--mail-triangle);
            clip-path: polygon(0 100%, 50% 55%, 100% 100%);
        }
        .background {
            position: absolute;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background: var(--mail-background);
            clip-path: polygon(0 24px, 50% 0, 100% 24px, 100% 100%, 0 100%);
        }
        .shadow {
            background: black;
            width: 92px;
            height: 4px;
            border-radius: 50%;
            position: absolute;
            top: 108%;
            left: -4px;
            background: var(--mail-shadow);
            animation: shadow 2s ease infinite;
        }
        .body {
            width: 360px;
            height: 260px;
            bottom: 0;
            left: -138px;
            border-radius: 1px;
            background: var(--paper);
            box-shadow: inset 0 0 0 1px var(--paper-border);
            position: absolute;
            transform: translateY(36%) translateZ(0) scale(.2, .16) rotate(90deg);
            .game {
                width: 360px;
                height: 260px;
                position: relative;
                transition: opacity .3s ease .8s;
                .headline {
                    position: absolute;
                    left: 0;
                    right: 0;
                    top: -32px;
                    display: flex;
                    justify-content: space-between;
                    align-items: center;
                    transform: translateZ(0);
                    span {
                        color: var(--headline-color);
                        font-size: 16px;
                        font-weight: 600;
                        line-height: 24px;
                    }
                    .close {
                        cursor: pointer;
                        svg {
                            width: 20px;
                            height: 20px;
                            display: block;
                            fill: var(--text-color);
                            padding: 2px;
                        }
                    }
                }
                .paddle,
                .ball {
                    top: 0;
                    position: absolute;
                    transition: opacity .3s;
                    transform: translate(var(--x, 0), var(--y, 0));
                }
                .paddle {
                    width: 6px;
                    height: 48px;
                    border-radius: 3px;
                    --y: 106px;
                    background: var(--game-paddle);
                    &.one {
                        left: 0;
                    }
                    &.two {
                        right: 0;
                    }
                }
                .ball {
                    background: var(--game-ball);
                    border-radius: 50%;
                    width: 16px;
                    height: 16px;
                    left: 0;
                }
                .controls {
                    bottom: -80px;
                    left: 0;
                    right: 0;
                    position: absolute;
                    span {
                        display: block;
                        text-align: center;
                        margin-bottom: 12px;
                        font-size: 14px;
                        font-weight: 500;
                        color: var(--controls-text);
                    }
                    div {
                        display: flex;
                        justify-content: center;
                        button {
                            width: 64px;
                            padding: 8px 0;
                            margin: 0;
                            background: var(--controls-background);
                            &:not(:last-child) {
                                margin-right: 16px;
                            }
                            svg {
                                width: 20px;
                                height: 20px;
                                display: block;
                                margin: 0 auto;
                                fill: var(--controls-icon);
                            }
                        }
                    }
                }
                .start {
                    position: absolute;
                    text-align: center;
                    white-space: nowrap;
                    left: 50%;
                    top: 50%;
                    transform: translate(-50%, -50%);
                    transition: opacity .3s;
                    button {
                        color: var(--confirm-color);
                        background: var(--confirm-background);
                    }
                    small {
                        margin: 4px 0 0 0;
                        display: block;
                        font-style: italic;
                        font-size: 12px;
                        color: var(--text-color);
                    }
                }
                &:not(.idle) {
                    .start {
                        opacity: 0;
                        pointer-events: none;
                    }
                }
                &:not(.init) {
                    .ball {
                        opacity: 0;
                    }
                }
            }
        }
    }
    h1 {
        text-align: center;
        margin: 0 0 8px 0;
        font-family: inherit;
        font-weight: 600;
        font-size: 24px;
        color: var(--headline-color);
    }
    p {
        text-align: center;
        margin: 0;
        font-size: 16px;
        color: var(--text-color);
    }
    .cta {
        margin-top: 32px;
        button {
            color: var(--confirm-color);
            background: var(--confirm-background);
        }
    }
    &:not(.show-game) {
        .letter {
            .body {
                .game {
                    opacity: 0;
                    pointer-events: none;
                    transition-delay: 0s;
                }
            }
        }
    }
    &.show-game {
        .letter {
            animation-play-state: paused;
            .body {
                animation: paper .8s linear forwards;
            }
            .shadow {
                animation-play-state: paused;
            }
        }
    }
    &.hide-game {
        .letter {
            .body {
                animation: paper-back .8s linear forwards;
            }
        }
    }
}

@keyframes paper {
    30% {
        z-index: 0;
        transform: translateY(18%) translateZ(0) scale(.2, .16) rotate(90deg);
    }
    60%,
    100% {
        z-index: 2;
    }
    60% {
        transform: translateY(0) translateZ(0) scale(.2, .16) rotate(0deg);
    }
    100% {
        transform: translateY(63%) translateZ(0);
    }
}

@keyframes paper-back {
    0% {
        transform: translateY(63%) translateZ(0);
    }
    30% {
        transform: translateY(0) translateZ(0) scale(.2, .16) rotate(0deg);
    }
    60% {
        z-index: 0;
        transform: translateY(18%) translateZ(0) scale(.2, .16) rotate(90deg);
    }
    0%,
    30% {
        z-index: 2;
    }
    100% {
        transform: translateY(36%) translateZ(0) scale(.2, .16) rotate(90deg);
    }
}

@keyframes letter {
    50% {
        transform: translateY(-4px);
    }
}

@keyframes shadow {
    50% {
        opacity: .7;
        transform: translateY(4px) scale(.8);
    }
}

html {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

* {
    box-sizing: inherit;
    &:before,
    &:after {
        box-sizing: inherit;
    }
}

// dribbble & twitter
body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Inter', 'Inter UI', Arial;
    background: #F2F5FF;
    .twitter {
        position: fixed;
        display: block;
        right: 24px;
        bottom: 24px;
        svg {
            width: 32px;
            height: 32px;
            fill: #1da1f2;
        }
    }
}
!

JS 

              
                const $ = (s, o = document) => o.querySelector(s);
const $$ = (s, o = document) => o.querySelectorAll(s);

var unsubscribe = $('#unsubscribe'),
    game = $('.game', unsubscribe),
    confirmButton = $('.confirm', unsubscribe),
    upButton = $('.controls .up', game),
    downButton = $('.controls .down', game),
    startButton = $('.start', game),
    closeButton = $('.close', game);

var ball = {
        elem: $('.ball', game),
        x: 0,
        y: 0,
        top: 0,
        left: 0
    },
    one = {
        elem: $('.paddle.one', game),
        y: 0,
        top: 0,
        score: 0
    },
    two = {
        elem: $('.paddle.two', game),
        y: 0,
        score: 0
    },
    interval;

function init() {

    if(game.classList.contains('idle')) {

        one.y = game.offsetHeight / 2 - one.elem.offsetHeight / 2;
        two.y = game.offsetHeight / 2 - one.elem.offsetHeight / 2;

        start();

        game.classList.remove('idle');
        game.classList.add('init');

    }

}

startButton.addEventListener('click', init);

confirmButton.addEventListener('click', e => {
    unsubscribe.classList.add('show-game');
});

closeButton.addEventListener('click', e => {
    unsubscribe.classList.add('hide-game');
    unsubscribe.classList.remove('show-game');
    setTimeout(() => unsubscribe.classList.remove('hide-game'), 800);
});

function start() {

    ball.x = game.offsetWidth / 2 - ball.elem.offsetWidth / 2;
    ball.y = game.offsetHeight / 2 - ball.elem.offsetHeight / 2;
    ball.top = Math.random() * 2 + 2;
    //ball.left = ((Math.random() < .5) ? 1 : -1) * (Math.random() * 2 + 2);
    ball.left = (1 * Math.random() * 2 + 2);

    interval = window.setInterval(render, 1000 / 60);
}

function render() {

    one.y += one.top;
    two.y = ball.y - two.elem.offsetHeight / 2;

    ball.x += ball.left;
    ball.y += ball.top;

    if(one.y <= 0) {
        one.y = 0;
    }

    if(two.y <= 0) {
        two.y = 0;
    }

    if(one.y >= game.offsetHeight - one.elem.offsetHeight) {
        one.y = game.offsetHeight - one.elem.offsetHeight;
    }

    if(two.y > game.offsetHeight - two.elem.offsetHeight) {
        two.y = game.offsetHeight - two.elem.offsetHeight;
    }

    if(ball.y <= 0 || ball.y >= game.offsetHeight - ball.elem.offsetHeight) {
        ball.top = -ball.top;
    }

    if(ball.x <= (one.elem.offsetWidth - 2)) {
        if((ball.y + ball.elem.offsetHeight / 2 ) > one.y && (ball.y + ball.elem.offsetHeight / 2 ) < one.y + one.elem.offsetHeight) {
            ball.left = -ball.left;
        } else {
            two.score++;
            setTimeout(() => game.classList.add('idle'), 500);
            clearInterval(interval);
            //start();
        }
    }

    if(ball.x >= game.offsetWidth - ball.elem.offsetWidth - (two.elem.offsetWidth - 2)) {
        if((ball.y + ball.elem.offsetHeight / 2 ) > two.y && (ball.y + ball.elem.offsetHeight / 2 ) < two.y + two.elem.offsetHeight) {
            ball.left = -ball.left;
        } else {
            one.score++
            setTimeout(() => game.classList.add('idle'), 500);
            clearInterval(interval);
            //start();
        }
    }

    one.elem.style.setProperty('--y', one.y + 'px');
    two.elem.style.setProperty('--y', two.y + 'px');
    ball.elem.style.setProperty('--x', ball.x + 'px');
    ball.elem.style.setProperty('--y', ball.y + 'px');

}

document.addEventListener('keydown', e => {
    e.preventDefault();
    init();
    if(e.keyCode == 38 || e.which == 38) {
        one.top = -8;
    }
    if(e.keyCode == 40 || e.which == 40) {
        one.top = 8;
    }
}, false);

document.addEventListener('keyup', e => {
    e.preventDefault();
    init();
    if(e.keyCode == 38 || e.which == 38) {
        one.top = 0;
    }
    if(e.keyCode == 40 || e.which == 40) {
        one.top = 0;
    }
}, false);

upButton.onmousedown = e => {
    init();
    one.top = -8;
};

downButton.onmousedown = e => {
    init();
    one.top = 8;
};

upButton.onmouseup = e => {
    one.top = 0;
};

downButton.onmouseup = e => {
    one.top = 0;
};

upButton.ontouchstart = e => {
    init();
    one.top = -8;
};

downButton.ontouchstart = e => {
    init();
    one.top = 8;
};

upButton.ontouchend = e => {
    one.top = 0;
};

downButton.ontouchend = e => {
    one.top = 0;
};
!
999px

Console