.rtf {
    box-sizing: border-box;
    margin: 25px;
    position: fixed;
    white-space: nowrap;
    z-index: 9998;
    padding-left: 0;
    list-style: none;
    &.open {
        .rtf--mb {
            > * {
                transform-origin: center center;
                transform: none;
                transition: ease-in-out transform 0.2s;
            }
            > ul {
                list-style: none;
                margin: 0;
                padding: 0;
            }
        }
        .rtf--ab__c {
            &:hover {

                > span {
                    transition: ease-in-out opacity 0.2s;
                    opacity: 0.9;
                }
            }
            > span.always-show {
                transition: ease-in-out opacity 0.2s;
                opacity: 0.9;
            }
            &:nth-child(1) {
                transform: translateY(-60px) scale(1);
                transition-delay: 0.03s;
                &.top {
                    transform: translateY(60px) scale(1);
                }
            }
            &:nth-child(2) {
                transform: translateY(-120px) scale(1);
                transition-delay: 0.09s;
                &.top {
                    transform: translateY(120px) scale(1);
                }
            }
            &:nth-child(3) {
                transform: translateY(-180px) scale(1);
                transition-delay: 0.12s;
                &.top {
                    transform: translateY(180px) scale(1);
                }
            }
            &:nth-child(4) {
                transform: translateY(-240px) scale(1);
                transition-delay: 0.15s;
                &.top {
                    transform: translateY(240px) scale(1);
                }
            }
            &:nth-child(5) {
                transform: translateY(-300px) scale(1);
                transition-delay: 0.18s;
                &.top {
                    transform: translateY(300px) scale(1);
                }
            }
            &:nth-child(6) {
                transform: translateY(-360px) scale(1);
                transition-delay: 0.21s;
                &.top {
                    transform: translateY(360px) scale(1);
                }
            }
        }
    }
}

.rtf--mb__c {
    padding: 25px;
    margin: -25px;
    *:last-child {
        margin-bottom: 0;
    }
    &:hover {
        > span {
            transition: ease-in-out opacity 0.2s;
            opacity: 0.9;
        }
    }
    > span.always-show {
        transition: ease-in-out opacity 0.2s;
        opacity: 0.9;
    }
    > span {
        opacity: 0;
        transition: ease-in-out opacity 0.2s;
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        margin-right: 6px;
        margin-left: 4px;
        background: rgba(0, 0, 0, 0.75);
        padding: 2px 4px;
        border-radius: 2px;
        color: #fff;
        font-size: 13px;
        box-shadow: 0 0 4px rgba(0, 0, 0, 0.14), 0 4px 8px rgba(0, 0, 0, 0.28);
        &.right {
            right: 100%;
        }
    }
}

.rtf--mb {
    height: 56px;
    width: 56px;
    z-index: 9999;
    background-color: #666;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    position: relative;
    border: none;
    border-radius: 50%;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.14), 0 4px 8px rgba(0, 0, 0, 0.28);
    cursor: pointer;
    outline: none;
    padding: 0;
    -webkit-user-drag: none;
    font-weight: bold;
    color: #f1f1f1;
    font-size: 18px;
    > * {
        transition: ease-in-out transform 0.2s;
    }
}

.rtf--ab__c {
    display: block;
    position: absolute;
    top: 0;
    right: 1px;
    padding: 10px 0;
    margin: (-10px) 0;
    transition: ease-in-out transform 0.2s;
    > span {
        opacity: 0;
        transition: ease-in-out opacity 0.2s;
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        margin-right: 6px;
        background: rgba(0, 0, 0, 0.75);
        padding: 2px 4px;
        border-radius: 2px;
        color: #fff;
        font-size: 13px;
        box-shadow: 0 0 4px rgba(0, 0, 0, 0.14), 0 4px 8px rgba(0, 0, 0, 0.28);
        &.right {
            right: 100%;
        }
    }
    &:nth-child(1) {
        transform: translateY(-60px) scale(0);
        transition-delay: 0.21s;
        &.top {
            transform: translateY(60px) scale(0);
        }
    }
    &:nth-child(2) {
        transform: translateY(-120px) scale(0);
        transition-delay: 0.18s;
        &.top {
            transform: translateY(120px) scale(0);
        }
    }
    &:nth-child(3) {
        transform: translateY(-180px) scale(0);
        transition-delay: 0.15s;
        &.top {
            transform: translateY(180px) scale(0);
        }
    }
    &:nth-child(4) {
        transform: translateY(-240px) scale(0);
        transition-delay: 0.12s;
        &.top {
            transform: translateY(240px) scale(0);
        }
    }
    &:nth-child(5) {
        transform: translateY(-300px) scale(0);
        transition-delay: 0.09s;
        &.top {
            transform: translateY(300px) scale(0);
        }
    }
    &:nth-child(6) {
        transform: translateY(-360px) scale(0);
        transition-delay: 0.03s;
        &.top {
            transform: translateY(360px) scale(0);
        }
    }
}

.rtf--ab {
    height: 48px;
    width: 48px;
    background-color: #aaa;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    position: relative;
    border: none;
    border-radius: 50%;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.14), 0 4px 8px rgba(0, 0, 0, 0.28);
    cursor: pointer;
    outline: none;
    padding: 0;
    -webkit-user-drag: none;
    font-weight: bold;
    color: #f1f1f1;
    margin-right: 4px;
    font-size: 16px;
    z-index: 10000;
}