.crmEntityFormView input[aria-label="Company Name"],
.crmEntityFormView input[id$="parentcustomerid_name"] {
    pointer-events: none !important;
    background: #f5f5f5 !important;
    color: #666 !important;
}

.crmEntityFormView .input-group-btn>button.launchentitylookup,
.crmEntityFormView .input-group-btn>button.clearlookupfield {
    display: none !important;
}

.crmEntityFormView td.clearfix.cell.lookup.form-control-cell,
.crmEntityFormView td.clearfix.cell.lookup.form-control-cell>div.control,
.crmEntityFormView td.clearfix.cell.lookup.form-control-cell .input-group,
.crmEntityFormView td.clearfix.cell.lookup.form-control-cell input[id$="parentcustomerid_name"],
.crmEntityFormView td.clearfix.cell.lookup.form-control-cell input[aria-label="Company Name"] {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box;
}