.chat {
    width: 40px;
    height: 40px;
    
    border: none;
    border-radius: 50%;
    
    color: #FFFFFF;
    background: #2BB43E;

    font-size: 24px;
    
    display: flex;
    align-items: center;
    justify-content: center;

    position: fixed;

    right: 80px;
    bottom: 40px;

    cursor: pointer;
}

@media only screen and (max-width: 800px) {
    .chat {
        right: 40px;
        bottom: 40px;
    }
}

@media only screen and (max-width: 600px) {
    .chat {
        right: 20px;
        bottom: 20px;
    }
}