select的option优化

src/static/web/css/admin.css

@@ -20,6 +20,8 @@ input[type=button],input[type=submit],input[type=reset]{padding:0.375rem 0.75rem
 input[type=radio],input[type=checkbox],input[type=radio]:focus,input[type=checkbox]:focus{width:14px;height:14px;outline:none;box-shadow:none;vertical-align:middle}
 select{padding:0.375rem 0.75rem;height:30px;color:var(--gray);background:var(--white);border:1px solid var(--gray-300);vertical-align:middle}
 select[multiple=yes]{height:180px}
+option{padding:0.25rem 0}
+option:checked{color:var(--blue)}
 textarea{padding:0.375rem 0.75rem;color:var(--gray);background:var(--white);border:1px solid var(--gray-300);vertical-align:middle}
 input:focus,select:focus,textarea:focus{color:var(--gray);background:var(--white);border-color:var(--blue-300);box-shadow:0 0 0 0.2rem rgba(0,123,255,0.25);outline:0}
 .install-box{margin:0 auto;width:800px}
@@ -164,8 +166,7 @@ table,input,select,textarea,.login-box,.colordlg,.pubdlg,.quickselitem .topcat,.
 .btn-sm{padding:0.375rem 0.6rem;height:30px;font-size:12px}
 .btn-xs{padding:0.22rem;height:20px;line-height:1;font-size:12px;border-radius:0.35rem!important}
 .btn+.btn{margin-left:10px}
-@media (min-width:1200px){.modal-dialog{max-width:500px}
-}
+@media (min-width:1200px){.modal-dialog{max-width:500px}}
 @media (max-width:768px){td{white-space:nowrap}
 .install-box,.login-from,.tips-box{width:100%}
 .tips{padding:0 1rem}