Added various css things

- Designed login and register buttons
- removed some unnecessary css things
- changed some small things in the design

frontend/src/components/InputField.js

@@ -5,7 +5,7 @@ function InputField(props) {
   return (
     <label className="input-field">
       <p>{props.LabelName}</p>
-      <input name={props.InputName} onChange={props.onChange} type={props.InputType} />
+      <input name={props.InputName} onChange={props.onChange} type={props.InputType} placeholder={props.InputPlaceHolder}/>
     </label>
   );
 }