.well.keep-task-open {
    height: auto;
    -moz-column-count: 3;
    -moz-column-gap: 1em;
    -moz-column-rule: 1px solid black;
    -webkit-column-count: 3;
    -webkit-column-gap: 1em;
    -webkit-column-rule: 1px solid black;
}

I love astrid for task managment, but the browser version could be better. Because I have a 1920x1200px monitor, the tasks feel a bit lonley in one column. I inject 3 columns, but you can use 2 columns like on the screenshot oder more:-) Be productive, have fun!