grafana/public/sass/pages/_alerting.scss

.alert-state-paused,
.alert-state-pending {
  color: $text-muted;
}

.alert-state-ok {
  color: $online;
}

.alert-state-warning {
  color: $warn;
}

.alert-state-critical {
  color: $critical;
}

.alert-notify-emails {
  width: 400px;
  border-right: 1px solid $black;
}

.alert-notify-emails .bootstrap-tagsinput {
  width: 394px; // offset for 8px left padding and border width
}

.alert-notify-emails .bootstrap-tagsinput input {
  border: 0;
}

// Alert List

.alert-list-item-state {
  font-weight: bold;
  .icon-gf, .fa {
    font-size: 120%;
    position: relative;
    top: 2px;
  }
}

.panel-has-alert {
  .panel-alert-icon:before {
    content: "\e611";
    position: relative;
    top: 1px;
    left: -3px;
  }
}

.panel-alert-state {
  &--alerting {
    box-shadow: 0 0 10px rgba($critical,0.5);
    position: relative;

    .panel-alert-icon:before {
      color: $critical;
      content: "\e610";
    }
  }

  &--alerting::after {
    content: '';
    position: absolute;
    top: 0;
    z-index: -1;
    width: 100%;
    height: 100%;
    box-shadow: 0 0 10px rgba($critical,1);
    opacity: 0;
    animation: alerting-panel 1.6s cubic-bezier(1,.1,.73,1) 0s infinite alternate;
  }


  &--ok {
    .panel-alert-icon:before {
      color: $online;
      content: "\e611";
    }
  }
}

@keyframes alerting-panel {
  100% {
    opacity: 1;
  }
}