fireInternet/res/extjs/resources/themes/stylesheets/ext4/default/util/_messagebox.scss

@mixin extjs-messagebox {
    .#{$prefix}message-box .#{$prefix}window-body {
        background-color: $window-background-color;
        border: none;
    }

    .#{$prefix}message-box .#{$prefix}progress-wrap {
        margin-top: 4px;
    }

    .#{$prefix}message-box-icon {
        width: 47px;
        height: 32px;
    }

    .#{$prefix}message-box-info,
    .#{$prefix}message-box-warning,
    .#{$prefix}message-box-question,
    .#{$prefix}message-box-error {
        background: transparent no-repeat top left;
    }

    .#{$prefix}message-box .#{$prefix}msg-box-wait {
        background-image: theme-background-image($theme-name, 'shared/blue-loading.gif');
    }

    .#{$prefix}message-box-info {
        background-image: theme-background-image($theme-name, 'shared/icon-info.gif');
    }

    .#{$prefix}message-box-warning {
        background-image: theme-background-image($theme-name, 'shared/icon-warning.gif');
    }

    .#{$prefix}message-box-question {
        background-image: theme-background-image($theme-name, 'shared/icon-question.gif');
    }

    .#{$prefix}message-box-error {
        background-image: theme-background-image($theme-name, 'shared/icon-error.gif');
    }
}