Spruce up small inputs with submit buttons

static/styles/global.css

@@ -11,10 +11,10 @@
   font-size: 110%;
 }
 
-.sidebar .box .add_form {
+.flex_input_container {
   display: flex;
 }
-.sidebar .box .add_form input[type=text] {
+.flex_input_container > input[type=text]{
   flex-grow: 1;
   box-sizing: border-box;
   width: 100%;