#mainimg {
    display: flex;
    justify-content: center;
    align-items: center;
}

#mainimg > img {
    width: 300px;
    height: 300px;

    border-radius: 10px;
}

#mainimg > button {
    width: 80px;
    height: 80px;
    background-color: rgb(118, 235, 8);
    color: white;

    border-radius: 50%;
    display: inline-flex;
    justify-content: center;
    align-items: center;

    font-weight: 100px; 
    font-size: 20px;

}