body,
head {
    margin: 0;
    font-family: cursive;
}

#wrapper {
    display: flex;
    height: 100vh;
    width: 100vw;
    background-color: pink;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

#btn {
    aspect-ratio: 1/1;
    background-color: transparent;
    position: absolute;
    top: auto;
    left: auto;
    border-radius: 100%;
    font-size: 150px;
    z-index: 99;
    animation: pulse 2.5s ease-in-out infinite;
    animation-direction: alternate-reverse;
    border: none;
}

#msg {
    font-size: 36px;
    margin-top: 35%;
}

#animation-base {
    position: absolute;
    top: auto;
    left: auto;
    border-radius: 100%;
    border: 200px solid rgb(255, 0, 0);
    animation: pulse 5s ease-in-out infinite;

}

@keyframes border-pulse {

    0% {
        border-width: 0px;
        border-color: rgba(255, 0, 0, 100);
    }

    50% {}

    100% {
        border-width: 200px;
        border-color: rgba(255, 0, 0, 0)
    }


}

@keyframes pulse {
    0% {
        border-width: 0px;
        border-color: rgba(255, 0, 0, 1);
        transform: scale(1);
    }

    50% {
        border-width: 0px;
        border-color: rgba(255, 0, 0, 1);
    }

    100% {
        border-width: 200px;
        border-color: rgba(255, 0, 0, 0);
        transform: scale(1.2);
    }
}