Youtube

<svg
    xmlns="http://www.w3.org/2000/svg"
    width="512"
    height="512"
    viewBox="0 0 512 512"
>
    <linearGradient
        id="a"
        x1="256"
        x2="256"
        y1="481"
        y2="31"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#5558ff" />
        <stop offset="1" stop-color="#00c0ff" />
    </linearGradient>
    <linearGradient
        id="b"
        x1="256"
        x2="256"
        y1="391"
        y2="121"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#addcff" />
        <stop offset=".503" stop-color="#eaf6ff" />
        <stop offset="1" stop-color="#eaf6ff" />
    </linearGradient>
    <path
        fill="url(#a)"
        d="M437 31H75C33.647 31 0 64.647 0 106v300c0 41.353 33.647 75 75 75h362c41.353 0 75-33.647 75-75V106c0-41.353-33.647-75-75-75z"
    />
    <path
        fill="url(#b)"
        d="M377 121H135c-24.902 0-45 20.099-45 45v180c0 24.899 20.098 45 45 45h242c24.902 0 45-20.101 45-45V166c0-24.9-20.098-45-45-45zm-69.401 148.5-90 45c-5.528 2.369-10.693 1.713-14.399-.601-4.497-3.001-7.2-7.8-7.2-12.9v-90c0-5.101 2.703-9.901 7.2-12.9 4.501-2.701 9.902-2.701 14.399-.601l90 45C312.7 245.2 316 250.3 316 256s-3.3 10.8-8.401 13.5z"
    />
</svg>