默认宽度为100%，如果要修改对

#app {

    align-items: center;

    display: flex;

    height: 100%;

    justify-content: center;

    overflow-x: hidden;

    width: 100%; /*这里修改宽度 */

}

图片及文字请修改script.js

const slideData = [

  {

    index: 0,

    headline: 'New Fashion Apparel',

    button: 'Shop now',

    src: '../img/fashion.jpg' },

   

  {

    index: 1,

    headline: 'In The Wilderness',

    button: 'Book travel',

    src: '../img/forest.jpg' },

   

  {

    index: 2,

    headline: 'For Your Current Mood',

    button: 'Listen',

    src: '../img/guitar.jpg' },

   

  {

    index: 3,

    headline: 'Focus On The Writing',

    button: 'Get Focused',

    src: '../img/typewriter.jpg' 

  }

];