notifications-admin/app/assets/stylesheets/components/broadcast-message.scss

.broadcast-message {

  &-wrapper {
    position: relative;
    width: 100%;
    max-width: 464px;
    box-sizing: border-box;
    padding: govuk-spacing(9) govuk-spacing(3) govuk-spacing(3) govuk-spacing(3);
    background: $panel-colour;
    box-shadow: inset 0 -1px 0 0 rgba(0, 0, 0, 0.05);
    border-radius: 5px;
    white-space: normal;
    margin: govuk-spacing(2) 0 govuk-spacing(4) 0;
    clear: both;
    word-wrap: break-word;
  }

  &-heading {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    padding: govuk-spacing(2) + 1px govuk-spacing(3) (govuk-spacing(2) - 1px) 46px;
    width: 100%;
    box-sizing: border-box;
    font-weight: bold;
    background: $grey-1 file-url('exclamation.svg');
    color: $white;
    background-size: 22px;
    background-repeat: no-repeat;
    background-position: govuk-spacing(3) 11px;
    border-top-right-radius: 5px;
    border-top-left-radius: 5px;
    box-shadow: inset 0 -1px 0 0 rgba(0, 0, 0, 0.1);
  }

}