How to make design like that using HTML and CSS

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CSS

HTML5

bootstrap

I need to make web design using html and css like below picture

and leave top 20 px above button upload and between buttons display borders as image below

my picture i need to do is like below

File sharing and storage made simple[^]

What I have tried:

what i try is

<input
    hidden
    type="file"
    (change)="uploadFile($event)"
/>

<button (click)="uploader.click()">
    Upload
</button>

<div style="width:400px;">
    <div style="float: left; width: 130px">
        <button
    (click)="submit()"
    mat-raised-button
    color="primary">
    Download
</button>
    </div>
    <div style="float: right; width: 225px">
        <button
    (click)="submit()"
    mat-raised-button
    color="primary">
    Export
</button>
    </div>
</div>