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HTML 

              
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        <h2>Click Me</h2>
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</div>
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</div>
!

CSS 

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

.container {
    background: #577b57;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    opacity: 0;
    z-index: -1;
    background: #f36686;
    position: fixed;
    top: 20%;
    bottom: 15%;
    left: 15%;
    right: 15%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-modal {
    position: absolute;
    right: -3rem;
    top: -4rem;
    border: transparent;
    background: transparent;
}

.btn-container {
    border: transparent;
    background: transparent;
}

.btn-container {
    display: inline-block;
}

.btn-container h2 {
    font-size: 1.5rem;
    text-transform: uppercase;
    letter-spacing: .2rem;
    font-weight: bold;
}

.btn-modal:focus,
.btn-container:focus {
    outline: none;
    border-radius: 50%;
    box-shadow: 0 0 0 6px red;
}

.img-btn-modal {
    display: inline-block;
    border: none;
}

.img-modal {
    display: inline-block;
    position: absolute;
    top: 15vh;
    left: 14vw;
}

.modal-is-open .modal-overlay {
    opacity: 1;
    z-index: 1;
}
!

JS 

              
                const btnContainer  = document.querySelector('.btn-container')
const btnModal = document.querySelector('.btn-modal')

btnContainer.addEventListener('click', _ => {
    document.body.classList.toggle('modal-is-open')
}, false)

btnModal.addEventListener('click', _ => {
    document.body.classList.toggle('modal-is-open')
})
!
999px

Console