.rb {
    border-style: solid;
    color: red;
}

.bb {
    border-style: solid;
    color: blue;
}

hr.dashed {
    border-top: 2px dashed #495057;
}

hr.dotted {
    border-top: 2px dotted #495057;
}

hr.solid {
    border-top: 2px solid #495057;
}

.transition-fade {
    opacity: 1;
    transition: 0.4s;
    transform: translateX(0);
    transform-origin: left;
}

html.is-animating .transition-fade {
    opacity: 0;
    transform: translateX(100%)
}