vaadin-framework/WebContent/VAADIN/themes/valo/shared/_reconnect-dialog.scss

@mixin valo-reconnect-dialog {
  .v-reconnect-dialog {
    color: white;
    top: $v-layout-spacing-vertical;
    right: $v-layout-spacing-horizontal;
    max-width: 100%;
    border-radius: 0;
    @include box-shadow(0 0 20px 0 rgba(0,0,0,0.25));
    padding: round($v-unit-size/3) round($v-unit-size/2.5);

    background-color: #444;
    background-color: rgba(#444, .9);
    line-height: round($v-font-size * 1.4);

    text-align: center;
    .text {
        display: inline-block;
        padding-left: 10px;
    }

    .spinner {
      @include valo-spinner;
      display: none;
      vertical-align: middle;
    }

    &.active .spinner {
      display: inline-block;
    }
  }
}