.btn-toggle {
    --unmarked-color: white;
    --marked-color: var(--blue);
    display: grid;
    grid-template-columns: 0 1fr;
    justify-content: center;
    align-items: center;
    flex: 1;
    background: var(--unmarked-color);
    overflow: hidden;
}

.btn-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
    visibility: hidden;
    padding: 0 !important;
}

.btn-toggle span {
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    color: var(--marked-color);
    background-color: var(--unmarked-color);
    z-index: 3;
    font-size: 1rem;
}

.btn-toggle input:checked + span {
    background-color: var(--marked-color);
    color: var(--unmarked-color);
    z-index: 1;
}