Filter

<svg
    xmlns="http://www.w3.org/2000/svg"
    width="512"
    height="512"
    viewBox="0 0 32 32"
>
    <linearGradient
        id="linear-gradient"
        gradientUnits="userSpaceOnUse"
        x1="16"
        x2="16"
        y1="-1.25"
        y2="33.25"
    >
        <stop offset="0" stop-color="#b621fe" />
        <stop offset="1" stop-color="#1fd1f9" />
    </linearGradient>
    <g id="filter" fill="url(#linear-gradient)" fill-rule="evenodd">
        <path
            d="m25.8 1.25h-19.6a4.952 4.952 0 0 0 -4.95 4.95v19.6a4.952 4.952 0 0 0 4.95 4.95h19.6a4.952 4.952 0 0 0 4.95-4.95v-19.6a4.952 4.952 0 0 0 -4.95-4.95zm3.45 24.55a3.452 3.452 0 0 1 -3.45 3.45h-19.6a3.452 3.452 0 0 1 -3.45-3.45v-19.6a3.452 3.452 0 0 1 3.45-3.45h19.6a3.452 3.452 0 0 1 3.45 3.45z"
        />
        <path
            d="m25.333 19.917h-11.008a3.084 3.084 0 0 0 -5.983 0h-1.675a.75.75 0 1 0 0 1.5h1.675a3.084 3.084 0 0 0 5.983 0h11.008a.75.75 0 0 0 0-1.5zm-14 2.333a1.583 1.583 0 1 1 1.584-1.583 1.584 1.584 0 0 1 -1.584 1.583z"
        />
        <path
            d="m25.333 10.583h-1.675a3.084 3.084 0 0 0 -5.983 0h-11.008a.75.75 0 1 0 0 1.5h11.008a3.084 3.084 0 0 0 5.983 0h1.675a.75.75 0 0 0 0-1.5zm-4.666 2.333a1.583 1.583 0 1 1 1.583-1.583 1.585 1.585 0 0 1 -1.583 1.584z"
        />
    </g>
</svg>