app/assets/stylesheets/_tables.scss
table {
margin-top: .5em;
}
table th,
table td {
border: none;
}
table th {
border-bottom: 2px solid $dark-gray;
}
table thead tr {
background-color: white;
}
tbody tr {
border-top: 1px solid $base-border-color;
}
tbody tr:hover {
background-color: $light-gray;
}