Envelope

<svg
    xmlns="http://www.w3.org/2000/svg"
    width="512"
    height="512"
    viewBox="0 0 64 64"
>
    <linearGradient
        id="a"
        x1="3.4"
        x2="60.6"
        y1="32"
        y2="32"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#5bb4f6" />
        <stop offset=".61" stop-color="#2191e5" />
        <stop offset="1" stop-color="#007edb" />
    </linearGradient>
    <path
        fill="url(#a)"
        d="M32 3.4A28.59 28.59 0 0 0 3.4 32 28.59 28.59 0 0 0 32 60.6 28.59 28.59 0 0 0 60.6 32 28.59 28.59 0 0 0 32 3.4zm16.52 43.49h-33a4.54 4.54 0 0 1-2.79-.89L25 33.87l6.55 6.56a.61.61 0 0 0 .43.18.58.58 0 0 0 .42-.18l6.6-6.56L51.27 46a4.54 4.54 0 0 1-2.75.89zm-33-29.78h33a4.54 4.54 0 0 1 2.64.85l-9.68 8.61A5.31 5.31 0 0 0 32.85 25a1.21 1.21 0 0 1-1.71 0 5.31 5.31 0 0 0-7.52 0 5.33 5.33 0 0 0-1.1 1.63L12.84 18a4.57 4.57 0 0 1 2.64-.89zm25.26 11.6a4.11 4.11 0 0 1-1.21 2.92L32 39.16l-7.53-7.53a4.12 4.12 0 0 1 0-5.83 4.1 4.1 0 0 1 5.82 0 2.41 2.41 0 0 0 3.41 0 4.13 4.13 0 0 1 7 2.91zm-18.59-.86a5.3 5.3 0 0 0 1.47 4.63l.55.55L11.88 45.1a4.51 4.51 0 0 1-1-2.78V21.68A4.52 4.52 0 0 1 12 18.79zM39.83 33l.55-.54a5.28 5.28 0 0 0 1.56-3.77 6.11 6.11 0 0 0-.08-.86L52 18.79a4.52 4.52 0 0 1 1.06 2.89v20.64a4.51 4.51 0 0 1-1 2.78z"
    />
</svg>