Answers for "disable expanding of textarea"

disable textarea resize

textarea {   /* for all text* area elements */
  resize: none;
}

#foo {                  /* for particular id */
  resize: none;
}

Textarea disable resize CSS

to disable all

textarea { resize: none; }
only vertical resize

textarea { resize: vertical; }
only horizontal resize

textarea { resize: horizontal; } 
disable vertical and horizontal with limit

textarea { resize: horizontal; max-width: 400px; min-width: 200px; }
disable horizontal and vertical with limit

textarea { resize: vertical; max-height: 300px; min-height: 200px; }