baron.css

/* CSS styles in this file are need for proper Baron work */
.wrapper {
    position: relative;
    overflow: hidden;
}
.scroller {
    height: 100%;
    overflow-y: scroll;
}
.scroller::-webkit-scrollbar { /* Preventing webkit bug of horizontal scrolling */
    width: 0;
}
.scroller__bar { /* The bar. You should define width, right and background */
    position: absolute;    
    z-index: 1;
    right: 0;
    width: 10px;
    background: #999;
}
.container { /* Data wrapper */
    overflow: hidden; /* For possible margin collapse removing */
}

.header {
    height: 36px;
}
.header__title {
    width: 100%;
    height: 36px; /* Must be same as header */
    margin: 0;
    -moz-box-sizing: border-box;
    box-sizing: border-box; /* For padding and border, if exist */
    background: #999;
}
.header__title_state_fixed {
    position: absolute;
    z-index: 1; /* Removing flicker effect */
}