html - Circle/Donut shape with a piece cut-off -


how can make image 1 below pure css or canvas? need have transparent background; can me this?

image

something (after possibly tinkering):

html,body{background:black;}    .nut{    height:200px;    width:200px;    border-radius:50%;    position:relative;    background-color:lightblue;    }    .nut:before{    position:absolute;    content:"";    height:40%;    width:40%;    background-color:black;    left:30%;    top:30%;    border-radius:50%;    }  .nut:after{   position:absolute;    content:"";    height:40%;    width:40%;    background-color:lightblue;    right:-5%;    bottom:-5%;    border-radius: 0 0 100% 0;    border-left:5px solid black;    border-top:5px solid black;  }
<div class="nut"></div>

in terms of allowing transparent background, illustrate like:

div {    border-radius: 50%;    height: 50px;    width: 50px;    border: 50px solid blue;    position: relative;    border-bottom-color: transparent;    transform: rotate(-45deg);    margin: 20px auto;  }  div:after {    content: "";    position: absolute;    top: -50px;    left: -50px;    height: 100%;    width: 100%;    border-radius: 50%;    border: 50px solid transparent;    border-bottom-color: blue;    transition: 0.6s;  }  div:before {    content: "";    position: absolute;    top: -10px;    left: -10px;    height: 100%;    width: 100%;    border: 10px solid blue;    border-radius: 50%;  }  div:hover:after {    top: -30px;    left: -50px;    border-bottom-color: tomato;  }  /*demo only*/    html {    text-align: center;    height: 100%;    background: radial-gradient(ellipse @ center, rgba(79, 79, 79, 1) 0%, rgba(34, 34, 34, 1) 100%);  }
hover me  <div></div>


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