Hacked up stylesheet for Jira to make it more like Trello

stylesheet.css

#ghx-board-name {
    color: #F6F6F6;
}

#ghx-header {
    background-color: #23719F;
}

#ghx-operations {
    background-color: #23719F;
    border-style: none;
    color: #F6F6F6;
    margin-top: 0;
}

#ghx-pool {
    background-color: #23719F;
    padding-top: 32px
;
}

#ghx-tab-details h4, .ghx-issue-links {
    display: none;
}

#ghx-work {
    background: #23719F;
    border-top: none;
}

.aui-blanket {
    display: none;
}

.ghx-column {
    background: #e3e3e3;
}

.ghx-column h2 {
    color: #393939;
    font-size: 15px;
    font-weight: bold;
    line-height: 18px;
}

.ghx-column-header-group {
    background-color: #23719F;
}

.ghx-column-headers {
    margin-top: -3px;
    padding-top: 3px;
}

.ghx-column-headers .ghx-column {
    border: none;
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
    padding-bottom: 2px;
    padding-left: 5px;
}

.ghx-column.ui-sortable {
    border-bottom-left-radius: 3px;
    border-bottom-right-radius: 3px;
    padding: 0 3px;
}

.ghx-detail-section, .ghx-detail-section .ghx-header {
    margin: 5px 0 0;
}

.ghx-end {
    background: transparent;
    box-shadow: none;
}

.ghx-fieldname-components, .ghx-fieldname-labels, .ghx-fieldname-versions, .ghx-fieldname-fixVersions {
    display: none;
}

.ghx-issue {
    background: #fff;
    border-bottom: 1px solid #ccc;
    border-radius: 3px;
    cursor: pointer;
    margin: 3px 3px 5px;
}

a.js-quickfilter-button {
    color: #F6F6F6;
}

/* Make issues look more like cards */

/* Column headers */

/* Negative 3 offset allows cards to scroll under, probably a better way */

/* Detail View */

/* Prevent comment modal window from having a blocking background */

/* Estimate */

dd.ghx-detail-description.ghx-fieldtype-number.ghx-fieldname-customfield_10004 {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 2em;
    color: rgba(51, 51, 51, 0.8);
    display: inline-block;
    font-size: 11px;
    font-weight: bold;
    line-height: 1;
    margin: 0;
    min-width: 2em;
    padding-bottom: 2px;
    padding-left: 5px;
    padding-right: 5px;
    padding-top: 3px;
    position: relative;
    right: 192px;
    text-align: center;
    top: -33px;
}

div.ghx-feedback.js-feedback-link {
    display: none;
}

div.ghx-grabber {
    height: 4px;
    margin-left: 14px;
    width: 40px;
}

div.ghx-parent-child {
    border-style: none;
}

dl.ghx-controls-filters.ghx-controls-sprint dt {
    color: #F6F6F6;
}

dt.ghx-cursor-help {
    color: #F6F6F6;
}

dt.ghx-detail-term.ghx-fieldtype-number.ghx-fieldname-customfield_10004 {
    font-size: 0;
}

span.ghx-name {
    color: #F6F6F6;
}