Hi i need to know how to turn this square to rounded edges radius 50px
body {
background-color: #241d33;
}
.rainbow-box {
background-color: #302244;
border: 5px solid transparent;
border-image: linear-gradient(to bottom right, #b827fc 0%, #2c90fc 25%, #b8fd33 50%, #fec837 75%, #fd1892 100%);
border-image-slice: 1;
height: 200px;
margin: 20px auto;
width: 200px;
}
<div class="rainbow-box"></div>