client/app/assets/less/inc/panel.less

.panel {
    box-shadow: none;
    border: 0;
}

.panel-heading {
    padding: 0;
    >p {
      &:last-child {
        margin-bottom: 0px;
      }
    }
    >a, .query-link {
      color: inherit;
    }
    .query-link {
      &:hover {
        text-decoration: underline;
      }
    }
}

.panel-title {
    & > a {
        padding: 10px 15px;
        display: block;
        font-size: 13px;
    }
}

.panel-collapse {
    .panel-heading {
        position: relative;

        .panel-title {
            & > a {
                padding: 8px 5px 16px 30px;
                color: #000;
                position: relative;
                border-bottom: 2px solid #eee;
            }
        }

        &:before {
            font-family: @font-icon;
            font-size: 17px;
            position: absolute;
            left: 0;
            top: 4px;
            content: "\f278";
        }

        &.active {
            &:before {
                content: "\f273";
            }
        }
    }


    .panel-body {
        border-top: 0 !important;
        padding-left: 5px;
        padding-right: 5px;
    }
}

.panel-collapse-color(@color) {
    .panel-collapse {
        .panel-heading {
            &.active .panel-title > a {
                border-bottom-color: @color;
            }
        }
    }
}

.panel-group {
    &:not([data-collapse-color]) {
        .panel-collapse-color(@blue);
    }

    &[data-collapse-color="red"] {
        .panel-collapse-color(@red);
    }

    &[data-collapse-color="green"] {
        .panel-collapse-color(@green);
    }

    &[data-collapse-color="amber"] {
        .panel-collapse-color(@amber);
    }

    &[data-collapse-color="teal"] {
        .panel-collapse-color(@teal);
    }

    &[data-collapse-color="black"] {
        .panel-collapse-color(@black);
    }

    &[data-collapse-color="cyan"] {
        .panel-collapse-color(@cyan);
    }
}