table.claim_tasks div.claimed,
table.claim_tasks div.claim_this_task {
    padding: 0.5em;
} 

table.claim_tasks div.claimed {
    color: red;
    border: 1px solid red;
}

table.claim_tasks div.claim_this_task {
    color: green;
    border: 1px solid green;
}
table.claim_tasks div.claim_this_task a {
    color: green;
}