src/panel.css

body {
  --fbc-blue-60: #0060df;
  --fbc-blue-70: #003eaa;
  --fbc-primary-text: #0c0c0d;
  --fbc-secondary-text: #737373;
  --fbc-gray-20: #ededf0;
  --fbc-transition: all .15s cubic-bezier(.07,.95,0,1);
  --fbc-borders: 1px solid #ededf0;
  font-family: "SF Pro Text", 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

html,
body {
  overflow: hidden;
  min-height: 200px;
  min-width: 355px;
  max-width: 355px;
  transition: all .25s ease-in-out;
}

h2,
h3,
div,
p,
a,
body,
span {
  margin: 0;
  font-size: 12px;
}

.main-content-wrapper {
  padding: 1.5rem 1.65rem;
  min-height: 100px;
}

h2,
p,
div.img {
  padding-bottom: 1rem;
}

.main-content-wrapper a:last-child {
  padding-bottom: 0;
}

h1 { /* "Facebook Container" headline for all panels */
  font-weight: 600;
  margin: 0;
  font-size: 13px;
  border-bottom: var(--fbc-borders);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
}

.btn-return.arrow-left {
  position: absolute;
  border: 0;
  left: 15px;
  top: 15px;
  width: 1.2rem;
  height: 1.2rem;
  background-color: rgba(255, 255, 255, 1);
  background-image: url("/img/arrow-icon-left.svg");
  cursor: pointer;
}

h2 { /* panel sub-head for all panels */
  display: flex;
  align-items: center;
}

h2,
.bold {
  font-weight: 700;
}

h3 {
  font-weight: 300;
}

.Facebook-text {
  color: var(--fbc-secondary-text);
  font-weight: 500;
  font-size: 14px;
}

.Facebook-text::after {
  background: url("/img/fbc-icon-dark.svg") center no-repeat;
  background-size: 14px auto;
  display: inline-block;
  width: 14px;
  height: 12px;
  margin-left: 4px;
  margin-bottom: -1px;
  content: "";
}

.Facebook-blue-text {
  color: #37ADFF;
  font-weight: 500;
  font-size: 14px;
}

.Facebook-blue-text::after {
  background: url("/img/briefcase.svg") center no-repeat;
  background-size: 17px auto;
  display: inline-block;
  width: 16px;
  height: 13px;
  margin-left: 6px;
  content: "";
}

p,
a {
  font-weight: 400;
  line-height: 140%;
}

a {
  color: var(--fbc-blue-60);
  text-decoration: none;
  cursor: pointer;
}

a:hover {
  color: var(--fbc-blue-70);
  border-bottom: 1.5px solid var(--fbc-blue-70);
}

.fw-bottom-btn { /* Full-width bottom bar "How Facebook Container Works" button. Only on non-onboarding panels. */
  padding: .7rem 0;
  background-color: transparent;
  border-top: var(--fbc-borders);
}

.highlight-on-hover { /* Full-width element that wraps around the "How Facebook Container Works" span and arrow icon */
  width: 100%;
  background-color: rgba(0, 0, 0, 0);
  border: 0;
  cursor: pointer;
  padding: .45rem 1.65rem;
  position: relative;
  display: flex;
  justify-content: space-between;
  transition: var(--fbc-transition);
}

.highlight-on-hover::after {
  position: absolute;
  display: inline-block;
  top: 0;
  bottom: 0;
  margin: auto;
  right: 15px;
  height: 100%;
  width: .35rem;
  background-image: url("/img/arrow-icon-right.svg");
  background-position: center center;
  transform: scale(1.3);
}

.highlight-on-hover.add-site-to-container::after {
  width: 16px;
  background-image: url("/img/site-add-icon.svg");
}

.highlight-on-hover.remove-site-from-container::after {
  width: 16px;
  background-image: url("/img/site-remove-icon.svg");
}

.highlight-on-hover.remove-site-from-container.disabled-button, .highlight-on-hover.add-site-to-container.disabled-button {
  cursor: not-allowed;
  position: relative;
  z-index: 0;
}

.highlight-on-hover.remove-site-from-container.disabled-button::after,
.highlight-on-hover.remove-site-from-container.disabled-button span,
.highlight-on-hover.add-site-to-container.disabled-button::after,
.highlight-on-hover.add-site-to-container.disabled-button span {
  opacity: 0.4;
}

#button-remove-site-tooltip {
  display: none;
  padding: 5px 10px 10px;
  width: 250px;
  max-width: 250px;
  z-index: 9999;
  position: absolute;
  left: 1rem;
  bottom: 2em;
  color: black;
  font-size: 13px;
  line-height: 17px;
  background-color: var(--fbc-gray-20);
  border: 1px solid #BEBEBF;
  box-shadow: 0 2px 4px 0 rgba(0,0,0,0.1);
  font-family: "SF Pro Text", 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif !important;
}

.highlight-on-hover.remove-site-from-container.disabled-button:hover #button-remove-site-tooltip {
  display: block;
}

.highlight-on-hover span {
  pointer-events: none;
}

.allowed-site-wrapper {
  display: block;
  position: relative;
  margin: .25rem 0;
  padding: .25rem 1.65rem;
  display: flex;
  align-items: center;
  min-height: 1.25rem;
  transition: var(--fbc-transition);
}

.remove-btn, .allow-btn {
  background-color: var(--fbc-blue-60);
  border: 1px solid var(--fbc-blue-60);
  border-top: 1px solid var(--fbc-blue-70);
  cursor: pointer;
  line-height: 41px;
  text-align: center;
  color: rgba(255, 255, 255, 1);
  font-size: 13px;
}

.remove-btn:hover, .allow-btn:hover {
  background-color: var(--fbc-blue-70);
}

.remove-site, .add-site {
  background-color: transparent;
  border: none;
  position: absolute;
  right: 1.65rem;
  height: 1.1rem;
  width: 1.1rem;
  background-image: url("/img/x-close.svg");
  background-position: center center;
  background-size: contain;
  cursor: pointer;
}

.remove-site-panel .allowed-site-wrapper, .add-site-panel .allowed-site-wrapper {
  padding: 0;
  margin-bottom: 1rem;
}

.remove-site-panel .allowed-site-wrapper:hover, .add-site-panel .allowed-site-wrapper:hover {
  background-color: transparent;
}

.allowed-site-wrapper:hover,
.highlight-on-hover:hover {
  background-color: var(--fbc-gray-20);
  transition: var(--fbc-transition);
}

.fw-bottom-btn,
.bottom-btns {
  display: flex;
  justify-content: space-between;
  transition: var(--fbc-transition);
  cursor: pointer;
}

.bottom-btns { /* Bottom "Cancel, Back, Next, Done" buttons - onboarding panels only */
  width: 100%;
}

.bottom-btn {
  border-bottom: 0;
  line-height: 103%;
  height: 3.37rem;
  width: 50%;
  color: var(--fbc-primary-text);
  padding: 1.15rem 0;
  text-align: center;
}

.bottom-btn:first-of-type { /* Onboarding Panels only: The first bottom button ("Cancel", "Back") is always gray */
  border-top: 1px solid rgba(24, 25, 26, 0.14);
  border-right: 1px solid rgba(24, 25, 26, 0.14);
  border-left: 0;
  background-color: rgba(12,12,13, 0.05);
  left: 0;
}

.bottom-btn:first-of-type:hover {
  background-color: rgba(204, 204, 204, 0.5);
}

.bottom-btn:last-of-type { /* Onboarding Panels only: The second bottom button on the onboarding panels is always blue */
  border-top: 1px solid var(--fbc-blue-70);
  border-left: 1px solid var(--fbc-blue-60);
  border-right: 0;
  color: rgba(255, 255, 255, 1);
  background-color: var(--fbc-blue-60);
  right: 0;
}

.bottom-btn:last-of-type:hover {
  background-color: var(--fbc-blue-70);
}

.allow-btn,
.allow-btn:hover,
.remove-btn,
.remove-btn:hover,
.bottom-btn,
.bottom-btn:hover {
  transition: var(--fbc-transition);
}

.in-fbc-subhead::before,
.trackers-detected-subhead::before {
  background-image: url("/img/fenced-badge.svg");
  background-position: center center;
  width: 23px;
  height: 19px;
  display: block;
  margin-right: 3px;
}

.img.in-fbc {
  background-image: url("/img/image-inFBC@2x.png");
  background-position: bottom center;
  height: 170px;
}

.img.trackers-detected {
  background-image: url("/img/image-tracker-detected@2x.png");
  height: 145px;
  margin: 1.25rem 0 1.75rem -4px;
  background-position: left, center;
}

.img.onboarding4 {
  background-image: url("/img/image-example@2x.png");
  height: 145px;
  margin: 1rem auto 1.5rem auto;
  background-position: center center;
}

.img.onboarding5 {
  background-image: url("/img/image-addsite@2x.png");
  height: 179px;
  margin: 1rem auto 1.5rem auto;
  background-position: center center;
}

.img {
  display: block;
  min-height: 100px;
}

.img,
.on-facebook-subbhead::before,
.in-fbc-subhead::before,
.highlight-on-hover::after,
.Facebook-text::after,
.trackers-detected-subhead::before,
.btn-return.arrow-left {
  content: "";
  background-repeat: no-repeat;
  background-size: contain;
}

/* Bottom button hacks until a more reasonable solution presents itself */
/* This eliminates (The-Powers-That-Be-Willing) a strange little white gap between
   the bottom edge of the 'bottom-btns' and the bottom edge of the panel. */

.onboarding5 .bottom-btn {
  height: 3.41rem;
}

h3 {
  margin-bottom: .5rem;
  padding: 0 1.65rem;
}

h3.sites-allowed {
  margin-top: 2rem;
}

/* allowed site flows */

.site-name {
  min-height: 13px;
}

.allowed-site-icon {
  content: "";
  display: inline-block;
  width: 1.1rem;
  height: 1.1rem;
  margin-right: 1.1rem;
  background-size: contain;
  background-repeat: no-repeat;
}

.site-lists-wrapper {
  min-height: 100px;
  padding-bottom: 1.65rem;
}

.allowed-site-wrapper.default-allowed-site:hover {
  background-color: rgba(255, 255, 255, 0);
}

.allowed-site-wrapper.default-allowed-site {
  pointer-events: none;
}

.favi-facebook {
  background-image: url("/img/favi-facebook.png");
}

.favi-instagram {
  background-image: url("/img/favi-instagram.png");
}

.favi-messenger {
  background-image: url("/img/favi-messenger.png");
}

.favi-whatsapp {
  background-image: url("/img/favi-whatsapp.png");
}

.favi-workplace {
  background-image: url("/img/favi-workplace.png");
}

#no-trackers .fw-bottom-btn:last-of-type {
  display: none;
}