button {
    min-width: 3.5em;
}
button.small {
    min-width: 0;
}

button,
input[type=checkbox],
label {
cursor: pointer;
}

th,
td {
    text-align: left;
}
th +th+th,
td +td+td {
    padding-left: 1em;
}
td +td+td {
    opacity: 0.6;
}