Update the contact record with Opportunity record

trigger contactupdate on Opportunity (after insert,after update) { 
    List<Contact> lstConToUpdate = new List<Contact>();
    Map<id,string> accids = new Map<id,string>();
    for(Opportunity opp : Trigger.new)
    {
        accids.put(opp.AccountId,opp.Phone__c);
    }
    List<Contact> listCon =[select id,name,AccountId,phone from contact where Accountid=:accids.keyset()];
    for(contact con: listCon)
    {
        if(accids.containsKey(con.AccountId))
        {
            con.Phone = accids.get(con.AccountId);
            lstConToUpdate.add(con);
        }
    }
    if(lstConToUpdate.size() > 0)
    {
        update lstConToUpdate;
    }
    
}