Checkbox

<svg
    xmlns="http://www.w3.org/2000/svg"
    width="512pt"
    height="512pt"
    viewBox="0 0 512 512"
>
    <linearGradient
        id="a"
        x1="0"
        x2="512"
        y1="256"
        y2="256"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#00f1ff" />
        <stop offset=".231" stop-color="#00d8ff" />
        <stop offset=".514" stop-color="#00c0ff" />
        <stop offset=".777" stop-color="#00b2ff" />
        <stop offset="1" stop-color="#00adff" />
    </linearGradient>
    <path
        fill="url(#a)"
        d="M512 256c0 141.387-114.613 256-256 256S0 397.387 0 256 114.613 0 256 0s256 114.613 256 256zm0 0"
    />
    <g fill="#fff">
        <path
            d="M374.668 430.125H137.332c-30.578 0-55.457-24.879-55.457-55.457V137.332c0-30.578 24.879-55.453 55.457-55.453h237.336c30.578 0 55.453 24.875 55.453 55.453v169.91c0 8.285-6.715 15-15 15-8.281 0-15-6.715-15-15v-169.91c0-14.035-11.418-25.453-25.453-25.453H137.332c-14.035 0-25.457 11.418-25.457 25.453v237.336c0 14.035 11.422 25.457 25.457 25.457h237.336c14.035 0 25.453-11.422 25.453-25.457 0-8.281 6.719-15 15-15 8.285 0 15 6.719 15 15 .004 30.578-24.875 55.457-55.453 55.457zm0 0"
        />
        <path
            d="M228.77 353.934c-10.708 0-20.825-4-28.672-11.371l-50.5-45.028c-6.184-5.512-6.727-14.992-1.211-21.176s14.996-6.726 21.175-1.214l50.66 45.167c.118.11.239.215.352.325a11.875 11.875 0 0 0 8.73 3.285 11.856 11.856 0 0 0 8.266-3.79l107.317-130.304c5.265-6.394 14.718-7.312 21.113-2.043 6.395 5.266 7.313 14.719 2.043 21.113l-107.55 130.59c-.134.16-.266.317-.403.473-7.637 8.527-18.14 13.477-29.578 13.937-.582.024-1.164.036-1.742.036zm0 0"
        />
    </g>
</svg>