Concrete

<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="512"
        y2="0"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#5558ff" />
        <stop offset="1" stop-color="#00c0ff" />
    </linearGradient>
    <path
        d="M345 15v294.749M225 15v272M467 15v294.749m10.531 4.131C453.368 306.2 433.08 287 405 287c-35.099 0-54.901 30-90 30s-54.901-30-90-30c-22.303 0-38.429 12.113-56.228 20.945-15.021 7.453-32.421.273-40.252-14.554C119.7 276.691 105 262.579 105 242c0-29.401 30-45.601 30-75 0-29.401-30-47.601-30-77 0-11.467 4.563-20.926 10.131-29.943C127.281 40.377 112.339 15 89.211 15H45c-16.5 0-30 13.5-30 30v422c0 16.5 13.5 30 30 30h422c16.5 0 30-13.5 30-30V342.134c0-12.545-7.513-24.454-19.469-28.254zM435 437h0m-60-30h0m-150 30h0M75 167h0m49.833 30H497M107.654 75H497M105 377c-16.569 0-30 13.431-30 30s13.431 30 30 30 30-13.431 30-30-13.431-30-30-30z"
        fill="none"
        stroke="url(#a)"
        stroke-width="30"
        stroke-linecap="round"
        stroke-linejoin="round"
        stroke-miterlimit="10"
    />
</svg>