.tabella_proposte {
	width:100%;
	border: 1px solid black;
    border-collapse: collapse;
}

th, td {
  padding: 15px;
  text-align: left;
}

tr {
	  border: 1px solid black;
}
	
.tabella_proposte tr:nth-child(even) {
  background-color: #eee;
}
.tabella_proposte tr:nth-child(odd) {
 background-color: #fff;
}
.tabella_proposte th {
  background-color: #fff;
  color: #000;
}