element-web/res/css/views/settings/tabs/_GeneralSettingsTab.scss

.mx_GeneralSettingsTab_profile {
  display: flex;
}

.mx_GeneralSettingsTab_profileControls {
  flex-grow: 1;
}

.mx_GeneralSettingsTab_profileControls .mx_Field #profileDisplayName {
  width: calc(100% - 20px); // subtract 10px padding on left and right
}

.mx_GeneralSettingsTab_profileAvatar {
  width: 88px;
  height: 88px;
  margin-left: 13px;
}

.mx_GeneralSettingsTab_profileAvatar div {
  display: block;
  width: 88px;
  height: 88px;
  border-radius: 4px;
  background-color: #ccc;
}