Paper plane fold animation button

paper-plane-fold.css

.button {
    --primary: #275EFE;
    --primary-dark: #2055EE;
    --primary-darkest: #133FC0;
    --text: #FFFFFF;
    --text-opacity: 1;
    --success: #2B3044;
    --success-scale: .2;
    --success-opacity: 0;
    --border-radius: 7;
    --overflow: hidden;
    --rotate: 0;
    --plane-x: 0;
    --plane-y: 0;
    --plane-opacity: 1;
    --left-wing-background: var(--primary);
    --left-wing-first-x: 0;
    --left-wing-first-y: 0;
    --left-wing-second-x: 50;
    --left-wing-second-y: 0;
    --left-wing-third-x: 0;
    --left-wing-third-y: 100;
    --left-body-background: var(--primary);
    --left-body-first-x: 50;
    --left-body-first-y: 0;
    --left-body-second-x: 50;
    --left-body-second-y: 100;
    --left-body-third-x: 0;
    --left-body-third-y: 100;
    --right-wing-background: var(--primary);
    --right-wing-first-x: 50;
    --right-wing-first-y: 0;
    --right-wing-second-x: 100;
    --right-wing-second-y: 0;
    --right-wing-third-x: 100;
    --right-wing-third-y: 100;
    --right-body-background: var(--primary);
    --right-body-first-x: 50;
    --right-body-first-y: 0;
    --right-body-second-x: 50;
    --right-body-second-y: 100;
    --right-body-third-x: 100;
    --right-body-third-y: 100;
    display: block;
    cursor: pointer;
    position: relative;
    border: 0;
    padding: 8px 0;
    min-width: 100px;
    text-align: center;
    margin: 0;
    line-height: 24px;
    font-family: inherit;
    font-weight: 500;
    font-size: 14px;
    background: none;
    outline: none;
    color: var(--text);
    transform: rotate(calc(var(--rotate) * 1deg)) translateZ(0);
    -webkit-appearance: none;
    -webkit-tap-highlight-color: transparent;
    .left,
    .right {
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
        opacity: var(--plane-opacity);
        transform: translate(calc(var(--plane-x) * 1px), calc(var(--plane-y) * 1px)) translateZ(0);
        &:before,
        &:after {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            right: 0;
            bottom: 0;
            border-radius: calc(var(--border-radius) * 1px);
            transform: translate(var(--x, .4%), var(--y, 0)) translateZ(0);
            z-index: var(--z-index, 2);
            background: var(--background, var(--left-wing-background));
            clip-path: polygon(calc(var(--first-x, var(--left-wing-first-x)) * 1%) calc(var(--first-y, var(--left-wing-first-y)) * 1%), calc(var(--second-x, var(--left-wing-second-x)) * 1%) calc(var(--second-y, var(--left-wing-second-y)) * 1%), calc(var(--third-x, var(--left-wing-third-x)) * 1%) calc(var(--third-y, var(--left-wing-third-y)) * 1%));
        }
    }
    .left:after {
        --x: 0;
        --z-index: 1;
        --background: var(--left-body-background);
        --first-x: var(--left-body-first-x);
        --first-y: var(--left-body-first-y);
        --second-x: var(--left-body-second-x);
        --second-y: var(--left-body-second-y);
        --third-x: var(--left-body-third-x);
        --third-y: var(--left-body-third-y);
    }
    .right:before {
        --x: -.4%;
        --z-index: 2;
        --background: var(--right-wing-background);
        --first-x: var(--right-wing-first-x);
        --first-y: var(--right-wing-first-y);
        --second-x: var(--right-wing-second-x);
        --second-y: var(--right-wing-second-y);
        --third-x: var(--right-wing-third-x);
        --third-y: var(--right-wing-third-y);
    }
    .right:after {
        --x: 0;
        --z-index: 1;
        --background: var(--right-body-background);
        --first-x: var(--right-body-first-x);
        --first-y: var(--right-body-first-y);
        --second-x: var(--right-body-second-x);
        --second-y: var(--right-body-second-y);
        --third-x: var(--right-body-third-x);
        --third-y: var(--right-body-third-y);
    }
    span {
        display: block;
        position: relative;
        z-index: 4;
        opacity: var(--text-opacity);
        &.success {
            z-index: 0;
            position: absolute;
            left: 0;
            right: 0;
            top: 8px;
            transform: rotate(calc(var(--rotate) * -1deg)) scale(var(--success-scale)) translateZ(0);
            opacity: var(--success-opacity);
            color: var(--success);
        }
    }
}

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

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


// Center & dribbble
body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Inter', Arial;
    background: #E1E6F9;
}

paper-plane-fold.html

<button class="button">
    <span class="default">Send</span>
    <span class="success">Sent</span>
    <div class="left"></div>
    <div class="right"></div>
</button>

paper-plane-fold.js

document.querySelectorAll('.button').forEach(button => {

    let getVar = variable => getComputedStyle(button).getPropertyValue(variable);

    button.addEventListener('click', e => {

        if(!button.classList.contains('active')) {

            button.classList.add('active');

            gsap.to(button, {
                keyframes: [{
                    '--left-wing-first-x': 50,
                    '--left-wing-first-y': 100,
                    '--right-wing-second-x': 50,
                    '--right-wing-second-y': 100,
                    duration: .2,
                    onComplete() {
                        gsap.set(button, {
                            '--left-wing-first-y': 0,
                            '--left-wing-second-x': 40,
                            '--left-wing-second-y': 100,
                            '--left-wing-third-x': 0,
                            '--left-wing-third-y': 100,
                            '--left-body-third-x': 40,
                            '--right-wing-first-x': 50,
                            '--right-wing-first-y': 0,
                            '--right-wing-second-x': 60,
                            '--right-wing-second-y': 100,
                            '--right-wing-third-x': 100,
                            '--right-wing-third-y': 100,
                            '--right-body-third-x': 60
                        })
                    }
                }, {
                    '--left-wing-third-x': 20,
                    '--left-wing-third-y': 90,
                    '--left-wing-second-y': 90,
                    '--left-body-third-y': 90,
                    '--right-wing-third-x': 80,
                    '--right-wing-third-y': 90,
                    '--right-body-third-y': 90,
                    '--right-wing-second-y': 90,
                    duration: .2
                }, {
                    '--rotate': 50,
                    '--left-wing-third-y': 95,
                    '--left-wing-third-x': 27,
                    '--right-body-third-x': 45,
                    '--right-wing-second-x': 45,
                    '--right-wing-third-x': 60,
                    '--right-wing-third-y': 83,
                    duration: .25
                }, {
                    '--rotate': 55,
                    '--plane-x': -8,
                    '--plane-y': 24,
                    duration: .2
                }, {
                    '--rotate': 40,
                    '--plane-x': 45,
                    '--plane-y': -180,
                    '--plane-opacity': 0,
                    duration: .3,
                    onComplete() {
                        setTimeout(() => {
                            button.removeAttribute('style');
                            gsap.fromTo(button, {
                                opacity: 0,
                                y: -8
                            }, {
                                opacity: 1,
                                y: 0,
                                clearProps: true,
                                duration: .3,
                                onComplete() {
                                    button.classList.remove('active');
                                }
                            })
                        }, 2000)
                    }
                }]
            })

            gsap.to(button, {
                keyframes: [{
                    '--text-opacity': 0,
                    '--border-radius': 0,
                    '--left-wing-background': getVar('--primary-darkest'),
                    '--right-wing-background': getVar('--primary-darkest'),
                    duration: .1
                }, {
                    '--left-wing-background': getVar('--primary'),
                    '--right-wing-background': getVar('--primary'),
                    duration: .1
                }, {
                    '--left-body-background': getVar('--primary-dark'),
                    '--right-body-background': getVar('--primary-darkest'),
                    duration: .4
                }, {
                    '--success-opacity': 1,
                    '--success-scale': 1,
                    duration: .25,
                    delay: .25
                }]
            })

        }

    })

});