#RightDownBtn {
    position: fixed;
    left: 1.875rem;
    bottom: 1.875rem;
    padding: 0.3125rem 0.625rem;
    background: #fff;
    border-radius: 0.1875rem;
    transition: 0.3s ease all;
    z-index: 1;
    align-items: flex-end;
    flex-direction: column;
    display: -moz-flex;
    display: flex;
    float: right;
}

#RightDownBtn>a,
#RightDownBtn>label {
    width: 1.5em;
    height: 1.5em;
    margin: 0.3125rem 0;
    transition: .2s cubic-bezier(.25, .46, .45, .94);
}

/* font color */
.DarkMode #page,
.DarkMode #colophon,
.DarkMode #vcomments .vbtn,
.DarkMode .art-content #archives .al_mon_list .al_mon,
.DarkMode .art-content #archives .al_mon_list span,
.DarkMode body,
.DarkMode .art-content #archives .al_mon_list .al_mon,
.DarkMode .art-content #archives .al_mon_list span,
.DarkMode button,
.DarkMode .art .art-content #archives a,
.DarkMode textarea,
.DarkMode strong,
.DarkMode a,
.DarkMode p,
.DarkMode li,
.DarkMode .label {
    color: rgba(255, 255, 255, .6);
}


.DarkMode #page,
.DarkMode body,
.DarkMode #colophon,
.DarkMode #main-container,
.DarkMode #page .yya,
.DarkMode #content,
.DarkMode #contentss,
.DarkMode #footer {
    background-color: #292a2d;
}
.DarkMode strong,
.DarkMode img {
    filter: brightness(.7);
}

/* sun and noon */
.Cuteen_DarkSky,
.Cuteen_DarkSky:before {
    content: "";
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 88888888
}

.Cuteen_DarkSky {
    background: linear-gradient(#feb8b0, #fef9db)
}

.Cuteen_DarkSky:before {
    transition: 2s ease all;
    opacity: 0;
    background: linear-gradient(#4c3f6d, #6c62bb, #93b1ed)
}

.DarkMode .Cuteen_DarkSky:before {
    opacity: 1
}

.Cuteen_DarkPlanet {
    z-index: 99999999;
    position: fixed;
    left: -50%;
    top: -50%;
    width: 200%;
    height: 200%;
    -webkit-animation: CuteenPlanetMove 2s cubic-bezier(.7, 0, 0, 1);
    animation: CuteenPlanetMove 2s cubic-bezier(.7, 0, 0, 1);
    transform-origin: center bottom
}

@-webkit-keyframes CuteenPlanetMove {
    0% {
        transform: rotate(0)
    }

    to {
        transform: rotate(360deg)
    }
}

@keyframes CuteenPlanetMove {
    0% {
        transform: rotate(0)
    }

    to {
        transform: rotate(360deg)
    }
}

.Cuteen_DarkPlanet:after {
    position: absolute;
    left: 35%;
    top: 40%;
    width: 9.375rem;
    height: 9.375rem;
    border-radius: 50%;
    content: "";
    background: linear-gradient(#fefefe, #fffbe8)
}