.close-panel::before {
    content: "⟨⟨";
}
.open-panel::before,.show-panel::before {
    content: "⟩⟩";
}
.icon-back::before {
    content: "⟨";
}

.icon-forward::before {
    content: "⟩";
}
.icon-back-arrow::before {
    content: "←";
}

.icon-forward-arrow::before {
    content: "→";
}