More business. Less Playmobil.

Trello Slim.css

/* ••• Works with Stylish ••••••• *
 * ••• https://userstyles.org ••• */


/* font size (cards etc) */
html, html body, html input, html select, html textarea {
  font-size: 12px;
  font-family: Tahoma;
} /* instead of 14px */


/**************** LIST container of cards *****************/

div#board div.list:first-child {
  	flex: 0 0 440px;

}
div.list {
    background-color: #ffffff !important;
    border-radius: 0px !important;
    padding: 0 !important;
    margin-top: 0 !important;
    margin-right: 1px !important;
    margin-bottom: 10px !important;
    margin-left: 1px !important;
  width: 100%;
	flex: 0 0 220px;
}

div.list.add-list.idle {
  display: none;
}
div.list div.list-header h2 {
    margin-top: 12px !important;
    margin-bottom: 7px !important;
    font-family: "Helvetica" !important;
    font-weight: 200;
  color: #666;
}
div.list div.list-header span.cardCounter {
    opacity: .5;
    font-size: .8rem;
  font-family: Tahoma;
  font-weight: normal;
  background: #999;
}

div.list div.list-header div.list-title {
    text-align: center !important;
    font-weight: 100 !important;
}

/**************** CARDS *****************/

/* card*/
div.list-card {
    border-color: #D6D6D6 !important;
    border: none !important;
    /*border-bottom: 1px solid #ddd ;*/
    border-top: 1px dotted #ccc !important;
    border-radius: 0px !important;
  max-width: 100%;
}
div.list-card-details {
  padding: 0 5px;
  }
span.list-card-operation {
	opacity: .33;
	background: none;
	color: red;
}
span.list-card-operation:hover {
	opacity: .66;
	color: red !important;
}
div.list-card.selected, div.list-card.active-card {
    /* on hover/selected */
    border-color: #828282 !important;
    /*box-shadow: 0 0 5px #828282 ;*/
    box-shadow: none !important;
}
div.list-card-labels {
    margin: 3px 0;
    position: absolute;
	right: 0;
  opacity: .67
}
div.list-card-details:hover div.list-card-labels {
    opacity: 1
}
div.list-card-labels .card-label {
    border-radius: 0;
    float: right;
    margin-bottom: 1px;
    border-radius: 4px;
    padding: 0;
    width: 8px;
    height: 8px;
    line-height: 100px;
}
div.list-card-stickers-area clearfix {
  	
}
div.list-card.has-stickers div.stickers {
  height: 35px;
}

div.list-card.has-stickers div.stickers div.sticker,
div.list-card.has-stickers div.stickers img.sticker-image {
  height: 40px;
  width: 40px;
}
div.list-card.has-stickers div.list-card-details {
  margin-top: 30px;
}
/* list top and bottom divider*/
.list-gradient-top, .list-gradient-bottom {background: none !important;}

/**************** ADD A CARD LINK *****************/

.list a.open-card-composer {
    text-align: center !important;
    border-radius: 0px !important;
    border-top: 1px dashed #ccc !important;
    margin: 0px!important;
    box-shadow: none !important;
    padding: 14px 0 !important;
    /*text-transform: uppercase ;*/
    /*font-size: 10px ;*/
    color: #51a1f7 !important;
    text-decoration: none !important;
    vertical-align: middle !important;
}
.open-card-composer:hover {
    background-color: #eee !important;
    /*color: #fff;*/
}
.open-card-composer:after {
    width: 100%;
    height: 5px;
    content: "";
    position: absolute;
    display:block;
    top: 45px;
    left: -0px;
    background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAFCAYAAABFA8wzAAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAAN1wAADdcBQiibeAAAABl0RVh0U29mdHdhcmUAd3d3Lmlua3NjYXBlLm9yZ5vuPBoAAABNSURBVBiVrZDBCcAgFMViB+oujuHdQZzQEbpCevmlYosnA4HPI6efVNnIMdwCDTjDFtvMuvOlqkxWvyw71K7mn+ixqFdYFl1We9r8Qm7P7JRO/qEsAwAAAABJRU5ErkJggg==");
}
.open-card-composer:hover:after {
    width: 100%;
    height: 5px;
    content: "";
    position: absolute;
    display:block;
    top: 45px;
    left: -0px;
    background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAFCAYAAABFA8wzAAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAAN1wAADdcBQiibeAAAABl0RVh0U29mdHdhcmUAd3d3Lmlua3NjYXBlLm9yZ5vuPBoAAABaSURBVBiVrZDBCYAwFEOjA3UXx+i9gzhhN/jvjxAvFkVUPBgIBPIgkAmwftR8yra9SiqSyp7vxt45wIAjotnW2RHRRv+VE9Azc7lCw0DlUH3iMnMB+mT/eqE2FJScDaGSTGgAAAAASUVORK5CYII=");
}

/* empty list fix */

.list-car-area, .list-cards.fancy-scrollbar {
    min-height: 0px!important;
}


/**************** CARD Labels *****************/

.list-cards .card-labels {
    /*margin-top: -14px!important;*/
}

div.list-cards div.card-labels span.card-label {
    height: 12px;
    width: 12pxt;
    border-radius: 6px;
    margin-top: -6px;
    margin-left: 6px;
}

.list-cards {
    padding: 0 !important;
}

div.card-label.blue-label {
    background-color: #3B7CFF !important;
}
div.card-label.green-label {
    background-color: #51C702 !important;
}
div.card-label.red-label {
    background-color: #C90000 !important;
}
div.card-label.orange-label {
    background-color: #FF6600 !important;
}
div.card-label.yellow-label {
    background-color: #EDED05 !important;
}
div.card-label.purple-label {
    background-color: #9933CC !important;
}

/**************** CARD MEMBERS *****************/

.member {
    border-radius: 15px !important;
    overflow: visible !important;
    margin-right: 5px !important;
}

.member img {
    border-radius: 15px !important;
}

.member .status, .member .member-type {
    border: 1px solid white !important;
    border-radius: 5px !important;
}

.member .status.active {
    background-color: #1b1 !important;
}

/**************** CARD CONTENT (back side) *****************/

/* labels */
.current.js-card-desc.js-show-with-desc {
background: #FDA;
outline: 5px solid #FDA;
}
.card-label {text-shadow: none !important;}
.list-card-details .badges {
	line-height: 8px;
      height: 8px;
      overflow: hidden;
    }
.list-card-details .badge-text,
.list-card-details .badge-icon {
  	line-height: 8px;
  font-size: 8px;
    margin-right: .25em;
    }
.list-card-details .badge-text {
          font-size: 9px;
                }
/* card content buttons */
.button-link:hover {
    background: -moz-linear-gradient(center top , #676767 0%, #3F3F3F 100%) repeat scroll 0 0 transparent !important;
    border-color: #3F3F3F !important;
    }
    
/* More links */
.pop-over-list li > a:hover,
.uploader:hover .fakefile {background: #424242 !important; border:none !important;}

/* button for comment etc */
input.primary[type="submit"], input.primary[type="button"], 
button.primary, .button.primary {
    background: -moz-linear-gradient(center top , #676767 0%, #3F3F3F 100%) repeat scroll 0 0 transparent !important; }

/* image/attachment icon and background */
.attachment-list li .preview .check-icon {background-color: #676767 !important;}
.attachment-list li .preview.is-cover {background-color: #676767 !important;}

a.button-link {
  font-weight: normal;
  }

/**************** TOGGLE BAR *****************/

.board-side-btn.left-side .arrow{
  border-left-color: #757575 !important;;
  border-right-color: #757575 !important;;
}
/* toggle arrow on the right */
.extra-large-window .board-wrapper.disabled-all-widgets .board-side-btn.right-side .arrow, 
.large-window .board-wrapper.disabled-all-widgets .board-side-btn.right-side .arrow, 
.medium-window .board-wrapper.disabled-all-widgets .board-side-btn.right-side .arrow {
    border-right-color: #757575 !important;} /* open arrow */ 
.extra-large-window .board-side-btn.right-side .arrow, 
.large-window .board-side-btn.right-side .arrow, 
.medium-window .board-side-btn.right-side .arrow {
    border-left-color: #757575 !important;} /* close arrow */ 
/* toggle bar */
.extra-large-window .board-side-btn:hover, 
.large-window .board-side-btn:hover, 
.medium-window .board-side-btn:hover {background: #ADADAD !important;}


/**************** WEBKIT SCROLLBARS *****************/

.extra-large-window.layout-horiz-scroll .board-wrapper.disabled-list-guide .list-guide,.large-window.layout-horiz-scroll .board-wrapper.disabled-list-guide .list-guide{display:none;}
.extra-large-window.layout-horiz-scroll .board-wrapper.disabled-list-guide #board,.large-window.layout-horiz-scroll .board-wrapper.disabled-list-guide #board{margin-left:8px;border-radius:3px;}
.extra-large-window.layout-horiz-scroll #board,.large-window.layout-horiz-scroll #board{border-top-left-radius:0;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:0;margin-left:155px;}
.extra-large-window.layout-horiz-scroll .list-area-wrapper,.large-window.layout-horiz-scroll .list-area-wrapper{overflow-x:scroll;overflow-y:hidden;}.extra-large-window.layout-horiz-scroll .list-area-wrapper::-webkit-scrollbar,.large-window.layout-horiz-scroll .list-area-wrapper::-webkit-scrollbar{height:13px;width:13px;}
.extra-large-window.layout-horiz-scroll .list-area-wrapper::-webkit-scrollbar-thumb:vertical,.large-window.layout-horiz-scroll .list-area-wrapper::-webkit-scrollbar-thumb:vertical,.extra-large-window.layout-horiz-scroll .list-area-wrapper::-webkit-scrollbar-thumb:horizontal,.large-window.layout-horiz-scroll .list-area-wrapper::-webkit-scrollbar-thumb:horizontal{background:#888a85;border-color:transparent;}
.extra-large-window.layout-horiz-scroll .list-area-wrapper::-webkit-scrollbar-track-piece,.large-window.layout-horiz-scroll .list-area-wrapper::-webkit-scrollbar-track-piece{background: rgba(245, 245, 245, 0.16);}
.extra-large-window.layout-horiz-scroll .list-area-wrapper::-webkit-scrollbar-button,.large-window.layout-horiz-scroll .list-area-wrapper::-webkit-scrollbar-button{display:block;height:2px;width:2px;}
.extra-large-window.layout-horiz-scroll .list-guide,.large-window.layout-horiz-scroll .list-guide{display:block;left:8px;position:absolute;top:42px;}
.extra-large-window.layout-horiz-scroll.window-up .list-guide,.large-window.layout-horiz-scroll.window-up .list-guide{-webkit-box-shadow:none;box-shadow:none;}
  
  
/**************** BOARD *****************/

/* board background */
div#board, div.list-guide {
    background-color: rgba(0,0,0,0.5);
}
.list-guide-wrapper .list-link.visible {
    background-color: rgba(255,255,255,0.1)
}

Sorry to bother you again but it seems that the plugin itself is not working correctly so I guess this is not due to your style.