设置img [alt]样式并卸载照片图标

What styling I have to add to css to center this "Image Preview" text: enter image description here I tried this:

.cover-avatar img[alt]{
width: 140px;
height: 190px;
/* line-height: 160px; */
/* text-align: center; */
/* vertical-align: middle; */
font-weight: 600;

}

另外,我想知道如何摆脱卸载的照片图标。