<div class="background">
        <img src="https://svgshare.com/i/aat.svg" alt="pikachu" class="pikachu">
        <button class="btn">SUBMIT</button>
    </div>

<!-- YOUTUBE VIDEO LINK HERE:
https://youtu.be/AWploCCjFdA -->

@import url('https://fonts.googleapis.com/css2?family=Lato:[email protected]&display=swap');

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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    width: 100%;
    background: #ECE7B4;
}

.background {
    display: flex;
    flex-direction: column;
    position: relative;
    justify-content: center;
    align-items: center;
}

.pikachu {
    width: 15vmin;
    height: 15vmin;
    transform: rotate(10deg);
    opacity: 0;
    transition: 0.3s;
}

.active {
    height: 15vmin;
    width: 15vmin;
    transform: translateY(-10vmin) rotate(10deg);
    opacity: 1;
    transition: 0.3 ease;
}

.btn {
    position: absolute;
    width: 30vmin;
    height: 10vmin;
    background: #32502E;
    color: #f3efcc;
    font-family: "Lato", sans-serif;
    font-size: 3vmin;
    letter-spacing: 0.5vmin;
    border-style: none;
    border: 2px solid #000;
    border-radius: 50px;
    outline: transparent;
    cursor: pointer;
    transition: background 0.5s;
}

.btn:hover {
    background: #000;
}

const submit = document.querySelector(".btn")
const pikachu = document.querySelector(".pikachu")

submit.addEventListener("click", appear)

function appear(){
    toggleAppear()
    setTimeout(function(){
        toggleAppear()
    }, 2000)
}

function toggleAppear(){
    pikachu.classList.toggle("active")
}