Box

<svg
    xmlns="http://www.w3.org/2000/svg"
    width="512"
    height="512"
    viewBox="0 0 32 32"
>
    <linearGradient
        id="a"
        x1="16"
        x2="16"
        y1="29"
        y2="3"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset=".036" stop-color="#ff3100" />
        <stop offset=".089" stop-color="#ff420a" />
        <stop offset=".232" stop-color="#ff6c20" />
        <stop offset=".379" stop-color="#ff8e33" />
        <stop offset=".528" stop-color="#ffa942" />
        <stop offset=".679" stop-color="#ffbc4d" />
        <stop offset=".834" stop-color="#ffc753" />
        <stop offset=".999" stop-color="#ffcb55" />
    </linearGradient>
    <path
        fill="url(#a)"
        d="M26 3H6a3.003 3.003 0 0 0-3 3v20a3.003 3.003 0 0 0 3 3h20a3.003 3.003 0 0 0 3-3V6a3.003 3.003 0 0 0-3-3zM13 5h6v6.04c-3.615-2.683-2.392-2.673-6 0zm14 21a1.001 1.001 0 0 1-1 1H6a1.001 1.001 0 0 1-1-1V6a1.001 1.001 0 0 1 1-1h5v8.053a1.007 1.007 0 0 0 1.605.797L16 11.272l3.396 2.578A1.007 1.007 0 0 0 21 13.053V5h5a1.001 1.001 0 0 1 1 1z"
    />
</svg>