element-call-Github/src/Header.module.css

.header {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  flex-shrink: 0;
}

.nav {
  display: flex;
  flex: 1;
  align-items: center;
  white-space: nowrap;
  padding: 0 20px;
  height: 64px;
}

.headerLogo {
  display: none;
  align-items: center;
  text-decoration: none;
}

.leftNav.hideMobile {
  display: none;
}

.leftNav > * {
  margin-right: 12px;
}

.leftNav h3 {
  font-size: 15px;
}

.rightNav {
  justify-content: flex-end;
}

.rightNav > * {
  margin-right: 24px;
}

.rightNav.hideMobile {
  display: none;
}

.nav > :last-child {
  margin-right: 0;
}

.roomAvatar {
  position: relative;
  display: none;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  border-radius: 36px;
  background-color: #5c56f5;
}

.roomAvatar > * {
  fill: white;
  stroke: white;
}

.backButton {
  background: transparent;
  border: none;
  display: flex;
  color: var(--textColor1);
  cursor: pointer;
  align-items: center;
}

.backButton h3 {
  margin: 0;
}

.backButton > * {
  margin-right: 12px;
}

.backButton > :last-child {
  margin-right: 0;
}

.userName {
  font-weight: 600;
  margin-right: 8px;
  text-overflow: ellipsis;
  overflow: hidden;
  flex-shrink: 1;
}

.signOutButton {
  background: transparent;
  border: none;
  color: rgb(255, 75, 85);
  cursor: pointer;
  font-weight: 600;
  flex-shrink: 0;
}

@media (min-width: 800px) {
  .headerLogo,
  .roomAvatar,
  .leftNav.hideMobile,
  .rightNav.hideMobile {
    display: flex;
  }

  .leftNav h3 {
    font-size: 18px;
  }

  .nav {
    height: 76px;
  }
}