我想将此进度栏放在页面的中央，这样，如果进入比我的屏幕小的屏幕，该网站将居中。

这是CSS代码：

.progress {
    display: inline-block;
    width: 400px;
    height: 50px;
    margin: 35px;
    border-radius: 20px;
    background: #A9A9A9;
    margin-left: inherit;
    position: absolute;
    left: 750px;
    top: 460px;
    float: left;
}

.bar {
    display: inline-block;
    border-radius: 20px;
    width: 5%;
    height: 100%;
    transition: width;
    transition-duration: 1s;
    transition-timing-function: cubic-bezier(.36,.55,.63,.48);
}

.shadow {
    /* 25 50 */
    box-shadow: 0px 45px 50px rgba(0,0.25); 
}

.leaf {
    background-color: #b5ccbf;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 80 40' width='60' height='30'%3E%3Cpath fill='%2340584a' fill-opacity='0.47' d='M0 40a19.96 19.96 0 0 1 5.9-14.11 20.17 20.17 0 0 1 19.44-5.2A20 20 0 0 1 20.2 40H0zM65.32.75A20.02 20.02 0 0 1 40.8 25.26 20.02 20.02 0 0 1 65.32.76zM.07 0h20.1l-.08.07A20.02 20.02 0 0 1 .75 5.25 20.08 20.08 0 0 1 .07 0zm1.94 40h2.53l4.26-4.24v-9.78A17.96 17.96 0 0 0 2 40zm5.38 0h9.8a17.98 17.98 0 0 0 6.67-16.42L7.4 40zm3.43-15.42v9.17l11.62-11.59c-3.97-.5-8.08.3-11.62 2.42zm32.86-.78A18 18 0 0 0 63.85 3.63L43.68 23.8zm7.2-19.17v9.15L62.43 2.22c-3.96-.5-8.05.3-11.57 2.4zm-3.49 2.72c-4.1 4.1-5.81 9.69-5.13 15.03l6.61-6.6V6.02c-.51.41-1 .85-1.48 1.33zM17.18 0H7.42L3.64 3.78A18 18 0 0 0 17.18 0zM2.08 0c-.01.8.04 1.58.14 2.37L4.59 0H2.07z'%3E%3C/path%3E%3C/svg%3E");
}

这是html代码：

<div class="progress">
      <div class="bar shadow leaf"></div>
</div>

这些是一些需要显示以及在较小屏幕上显示的照片： This is how it needs to look like

This is how it looks on smaller screen devices

只要忽略黑色的东西，那些按钮在较小的屏幕设备上看起来就不好看。