.presentation__sidebar__slide-link {
    /*box*/
    display: block;
    width:100%;
    height:100%;

    /*border*/
    border-width:2px;
    border-style: solid;
    border-color: transparent;
    border-radius: 4px;

    /*background*/
    background-color: var(--c-tertiary-4);
    -webkit-box-shadow: 0px 1px 4px rgb(0 0 0 / 16%);
    box-shadow: 0px 1px 4px rgb(0 0 0 / 16%);

    /*transition*/
    -webkit-transition: border-color 0.4s;
    transition: border-color 0.4s;
}

.presentation__sidebar__slide.is-active>.presentation__sidebar__slide-link {
    /*border*/
    border-color: var(--c-cta-2);
}