自定义上传按钮

.file_button_container,
.file_button_container input {
     height: 47px;
     width: 263px;
 }

 .file_button_container {
     background: transparent url(http://i.stack.imgur.com/BT5AB.png) left top no-repeat;
 }

 .file_button_container input {
     opacity: 0;
 }

<div class=\"file_button_container\"><input type=\"file\" /></div>

<label for=\"X\"></label>

<div class=\"container\">
  <label for=\"upload\" class=\"uploadButton\">Upload</label>
  <input type=\"file\" name=\"upload\" id=\"upload\">
</div>

.container {
  position: relative;
}
.uploadButton {
  height: 25px;
  width: 66px;
  display: block;
  cursor: pointer;
  background: url(\'http://www.ifunia.com/images/christmas/youtube-upload-button.gif\') center center no-repeat;
}
input[type=\"file\"] {
  display: block;
  width: 66px;
  height: 25px;
  clip: rect(0px 0px 0px 0px);
  position: absolute;
  left: 0;
  top: 0;
}

<form>
  <div class=\"container\">
    <label for=\"upload\" class=\"uploadButton\"></label>
    <input type=\"file\" name=\"upload\" id=\"upload\" required />
  </div>
  <hr/>
  <button type=\"submit\">Submit</button>
</form>

#my_upload_button{
  background-image:url(path-to-file.png);
  border:none;
}

<button class=\"upload\">Choose a file to upload...</button>

.upload{
    border:0;
    padding:10px 20px;
    -moz-border-radius:10px;
    border-radius:10px;
    background-color:#4488ee;
    color:white;
    font-size:16px;
}

<div class=\"fileUpload btn btn-primary\">
    <span>Upload</span>
    <input type=\"file\" class=\"upload\" />
</div>

.fileUpload {
    position: relative;
    overflow: hidden;
    margin: 10px;
}
.fileUpload input.upload {
    position: absolute;
    top: 0;
    right: 0;
    margin: 0;
    padding: 0;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    filter: alpha(opacity=0);
}

<label for=\"pic\" class=\"uploadfilelabel\" >upload </label>
<input type=\"hidden\" name=\"MAX_FILE_SIZE\" value=\"110000\">
<input id=\"pic\" name=\"pic\" type=\"file\" size=\"110000\">

 label.uploadfilelabel{/*custom label here*/}
 input[type=file]{display:none;}

#upload_file 
{
    display: none;
}

.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
    color: #fff;
}

.btn {
    -moz-user-select: none;
    border: 1px solid transparent;
    border-radius: 0.25rem;
    display: inline-block;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    padding: 0.375rem 0.75rem;
    text-align: center;
    transition: color 0.15s ease-in-out 0s, background-color 0.15s ease-in-out 0s, border-color 0.15s ease-in-out 0s, box-shadow 0.15s ease-in-out 0s;
    vertical-align: middle;
    white-space: nowrap;
}

<label for=\"upload_file\" class=\"custom-file-upload btn btn-primary\"><i class=\"fa fa-cloud-upload\"></i> File Upload</label>
<input class=\"margin\" type=\"file\" formnovalidate id=\"upload_file\" name=\"file\" accept=\"*\">