.dropdown-cores {
    position: relative;
    width: 100%;
}

.dropdown-cores select {
    appearance: none;
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px 12px;
    padding-right: 2.5rem;
}

.retangulo-tabela {
    width: 60px;
    height: 20px;
    border-radius: 3px;
    border: 1px solid #ffffff;
    display: inline-block;
    vertical-align: middle;
}

table.col-md-4 th,
table.col-md-4 td {
    vertical-align: middle;
    padding: 8px 12px;
}