.float-button {
    color: white;
    background-color: var(--dark-green);
    box-shadow: 2px 2px 3px var(--shadow);

    text-align: center;

    position: fixed;
    width: 60px;
    height: 60px;
    bottom: 20px;
    right: 20px;

    border-radius: 50px;
    -webkit-border-radius: 50px;
    -moz-border-radius: 50px;
    -ms-border-radius: 50px;
    -o-border-radius: 50px;

    display: flex;
    align-items: center;
    justify-content: center;

    z-index: 998;
}
.float-button:hover {
    background: var(--normal-green);

    transition: all 0.3s;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -ms-transition: all 0.3s;
    -o-transition: all 0.3s;
}