HTMLify

* {
    box-sizing: border-box;
}

body {
    background-color: #222224;
    height: 100vh;
    width: 100vw;
    position: relative;
}

.container {
    position: fixed;
    bottom: 1em;
    right: 1em;
}

.menu__toggle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: #1ef0a0;
    box-shadow: 4px 4px 2px 1px rgb(0 0 0 / 20%);
    position: absolute;
    z-index: 5;
    bottom: 0;
    right: 0;
    display: grid;
    place-items: center;
    cursor: pointer;
}

.menu__toggle span {
    color: #222224;
    font-size: 2em;
    transition: 0.4s;
}

.menu__toggle.open span {
    transform: rotate(135deg);
}

.menu__list {
    position: absolute;
    bottom: 0;
    right: 0;
    z-index: 3;
    list-style: none;
    margin: 0;
}

.menu__list .menu__item {
    width: 2.5em;
    height: 2.5em;
    border-radius: 50%;
    position: absolute;
    background-color: #e74a86;
    display: grid;
    place-items: center;
    bottom: 0.25em;
    right: 0.25em;
    transition: 0.4s;
}

.menu__list .menu__item a {
    color: #fff;
    text-decoration: none;
}

.menu__list.open .menu__item {
    box-shadow: 4px 4px 2px 1px rgba(0, 0, 0, 0.2);
}

.menu__list.open .menu__item:nth-of-type(1) {
    right: 0.5em;
    bottom: 4.25em;
    transition-delay: 0.2s;
}

.menu__list.open .menu__item:nth-of-type(2) {
    right: 3.5em;
    bottom: 3.5em;
    transition-delay: 0.1s;
}

.menu__list.open .menu__item:nth-of-type(3) {
    right: 4.25em;
    bottom: 0.5em;
}