style.css

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-size: 16px;
    line-height: 1.1;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: sans-serif;
    margin: auto;
}

h1 {
    margin-bottom: 2rem;
}

div {
    width: 400px;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: #c7ede6;
}

button {
    margin-top: 2rem;
    outline: none;
    border: 1px solid #000;
    background: transparent;
    padding: 1rem 2rem;
    cursor: pointer;
    color: #000;
}

svg path {
    stroke-dasharray: 500;
    stroke-dashoffset: 500;
    fill-opacity: 0;
}

.animation {
    animation: line 5s forwards, fill 1s forwards 2s;
}

@keyframes line {
    to {
        stroke-dashoffset: 0;
    }
}

@keyframes fill {
    to {
        fill-opacity: 1;
    }
}