.sp-header{border-bottom:var(--nav-border-thickness) solid;-o-border-image:linear-gradient(90deg,var(--accent-primary) 0,var(--accent-secondary) 50%,var(--accent-tertiary) 100%) 1;border-image:linear-gradient(90deg,var(--accent-primary) 0,var(--accent-secondary) 50%,var(--accent-tertiary) 100%) 1}