.bigpicture.winter-cleansky { background: url('../img400/winter-cleansky/03.jpg') center center no-repeat;}
.bigpicture.summer-cleansky { background: url('../img400/summer-cleansky/08.jpg') center center no-repeat;}
.bigpicture.autumn-cleansky { background: url('../img400/autumn-cleansky/04.jpg') center center no-repeat;}
.bigpicture.spring-cleansky { background: url('../img400/spring-cleansky/01.jpg') center center no-repeat;}

.bigpicture.winter-clouds { background: url('../img400/winter-clouds/01.jpg') center center no-repeat;}
.bigpicture.summer-clouds { background: url('../img400/summer-clouds/01.jpg') center center no-repeat;}
.bigpicture.autumn-clouds { background: url('../img400/autumn-clouds/02.jpg') center center no-repeat;}
.bigpicture.spring-clouds { background: url('../img400/spring-clouds/01.jpg') center center no-repeat;}

.bigpicture.winter-rain { background: url('../img400/winter-rain/01.jpg') center center no-repeat;}
.bigpicture.summer-rain { background: url('../img400/summer-rain/04.jpg') center center no-repeat;}
.bigpicture.autumn-rain { background: url('../img400/autumn-rain/03.jpg') center center no-repeat;}
.bigpicture.spring-rain { background: url('../img400/spring-rain/01.jpg') center center no-repeat;}

.bigpicture.winter-snow { background: url('../img400/winter-snow/05.jpg') center center no-repeat;}
.bigpicture.summer-snow { background: url('../img400/summer-snow/01.jpg') center center no-repeat;}
.bigpicture.autumn-snow { background: url('../img400/autumn-snow/01.jpg') center center no-repeat;}
.bigpicture.spring-snow { background: url('../img400/spring-snow/01.jpg') center center no-repeat;}