*, ::before, ::after {
    box-sizing: border-box;
}

h1, .h1, h2, .h2, h3, .h3, h4, .h4, h5, .h5, h6, .h6 {
    margin-top: 0;
    margin-bottom: 1rem;
}

hr {
    margin-top: 2rem;
}

a,
a::before, a::after {
    transition: color 0.2s ease-in-out 0s, text-decoration 0.2s ease-in-out 0s;
}

.hidden {
    display: none !important;
}

.invisible {
    visibility: hidden;
    user-select: none;
}