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

* {
  font: inherit;
  margin: 0;
  padding: 0;
  border: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: hsl(0, 0%, 100%);
  font-family: system-ui, sans-serif;
  color: hsl(230, 7%, 23%);
  font-size: 1.125rem; /* 18px */
  line-height: 1.4;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  color: hsl(230, 13%, 9%);
  font-weight: 700;
}

h1 {
  font-size: 2.5rem; /* 40px */
}

h2 {
  font-size: 2.125rem; /* 34px */
}

h3 {
  font-size: 1.75rem; /* 28px */
}

h4 {
  font-size: 1.375rem; /* 22px */
}

ol, ul, menu {
  list-style: none;
}

button, input, textarea, select {
  background-color: transparent;
  border-radius: 0;
  color: inherit;
  line-height: inherit;
  -webkit-appearance: none;
          appearance: none;
}

textarea {
  resize: vertical;
  overflow: auto;
  vertical-align: top;
}

a {
  color: hsl(250, 84%, 54%);
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

img, video, svg {
  display: block;
  max-width: 100%;
}

/* --------------------------------

Component

-------------------------------- */

:root {
  --avatar-sm: 1em;
  --avatar-md: 2em;
  --avatar-lg: 3em;
}

.avatar {
  position: relative;
  display: block;
  width: 1em;
  height: 1em;
  font-size: 1em; /* avatar size */
}

.avatar--sm {
  font-size: var(--avatar-sm);
}

.avatar--md {
  font-size: var(--avatar-md);
}

.avatar--lg {
  font-size: var(--avatar-lg);
}

.avatar__figure {
  width: 1em;
  height: 0;
  padding-bottom: 1em;
  border-radius: 50%; /* avatar border-radius */
  overflow: hidden;
}

.avatar__img, .avatar__placeholder {
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  width: 1em;
  height: 1em;
  border-radius: inherit;
}

.avatar__placeholder {
  background-color: hsl(240, 4%, 95%);
  color: hsl(225, 4%, 47%); /* icon color */
  fill: transparent;
}

.avatar--btn {
  background-color: transparent;
  padding: 0;
  border: 0;
  border-radius: 0;
  color: inherit;
  line-height: inherit;
  -webkit-appearance: none;
          appearance: none;
  cursor: pointer;
}

/* status */
.avatar__status {
  position: absolute;
  bottom: 0;
  right: 0;
  display: inline-block;
  width: 0.2em;
  height: 0.2em;
  border-radius: 50%;
  box-shadow: 0 0 0 2px hsl(0, 0%, 100%);
  background-color: hsl(225, 4%, 47%);
}

.avatar__status--active {
  background-color: hsl(170, 78%, 36%);
}

.avatar__status--busy {
  background-color: hsl(342, 89%, 48%);
}

.avatar__initials, .avatar__users-counter {
  position: absolute;
  top: 0;
  left: 0;
  width: 1em;
  height: 1em;
  border-radius: inherit;
  background-color: hsl(240, 4%, 85%);
  color: hsl(230, 13%, 9%);
  display: flex;
  justify-content: center;
  align-items: center;
}

.avatar__initials { /* initials - show letters if you don't have img */
  text-align: center;
}

.avatar__initials span {
  font-size: 0.5em;
}

/* tot number of users in a group of avatars */
.avatar__users-counter span {
  font-size: 0.42em;
}

/* group */
.avatar-group {
  display: flex;
  /* 👇 optional -> edit the size of all the avatars in the group */
  /* font-size: 1.75em; */
}

.avatar-group .avatar {
  margin-left: -0.1em;
}

.avatar-group .avatar__figure {
  box-shadow: 0 0 0 3px hsl(0, 0%, 100%);
}