.sandbox .mix{
 background:hsla(78,20%,20%,.3);
}
.sandbox .mix.film:after {
    border-right-color: #78A1A5;
}
.sandbox .mix.realisateur:after {
    border-right-color: #D78C5C;
}

.sandbox .mix.auteur:after {
    border-right-color: hsla(110,100%,50%,.8);
}
.sandbox .mix.film:after {
    border-right-color: hsla(78,60%,100%,.8);;
}
.sandbox .mix.galerie:after {
    border-right-color: hsla(8,60%,50%,.8);
}

.sandbox .mix.livre:after {
    border-right-color: hsla(58,60%,50%,.7);
}

.sandbox .mix.theme:after {
    border-right-color: hsla(188,60%,50%,.8);
}