Triangular Prism

<svg
    xmlns="http://www.w3.org/2000/svg"
    width="512"
    height="512"
    viewBox="0 0 512.007 512.007"
>
    <linearGradient
        id="a"
        x1="256.004"
        x2="256.004"
        y1="512.007"
        y2="135.007"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#00b59c" />
        <stop offset="1" stop-color="#9cffac" />
    </linearGradient>
    <linearGradient
        id="b"
        x1="256.004"
        x2="256.004"
        y1="150.007"
        y2="0"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#c3ffe8" />
        <stop offset=".997" stop-color="#f0fff4" />
    </linearGradient>
    <path
        fill="url(#a)"
        d="M61.004 135.007v362c0 8.291 6.709 15 15 15h360c8.291 0 15-6.709 15-15v-362z"
    />
    <path
        fill="url(#b)"
        d="m444.324 122.527-180-120a14.963 14.963 0 0 0-16.641 0l-180 120a15 15 0 0 0 8.32 27.48h360a14.998 14.998 0 0 0 8.321-27.48z"
    />
</svg>