<div class="whatsapp">
  <div class="bubble">
    <div class="phone">
      <div class="top">
      </div>
      <div class="bottom">
      </div>
    </div>
  </div>
</div>

:root {
  --logo-color: #4FD840;
}

body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #F5F5F5;
}

.whatsapp {
  width: 300px;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 1px 1px 3px #bfbfbf;
}

.bubble {
  width: 200px;
  height: 200px;
  border: 15px solid #fff;
  border-radius: 50%;
  position: relative;
}

.bubble:before {
  content: '';
  position: absolute;
  left: -32px;
  bottom: -45px;
  border: 30px solid;
  border-right-width: 60px;
  border-color: transparent #fff transparent transparent;
  transform: rotate(-52deg);
  z-index: 1;
}

.bubble:after {
  content: '';
  position: absolute;
  left: -3px;
  bottom: -20px;
  border: 20px solid;
  border-right-width: 35px;
  border-color: transparent var(--logo-color) transparent transparent;
  transform: rotate(-52deg);
  z-index: 2;
}

.whatsapp, .bubble {
  background-color: var(--logo-color);
}

.phone {
  width: 150px;
  height: 35px;
  background-color: #fff;
  border-bottom-left-radius: 100% 70px;
  border-bottom-right-radius: 100% 70px;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  transform: rotate(45deg);
  position: absolute;
  top: 47%;
  left: 6%;
}

.phone:after {
  content: '';
  width: 82px;
  height: 82px;
  background: #f00;
  position: absolute;
    border-bottom-left-radius: 100%40px;
  border-bottom-right-radius: 100%40px;
  top: -72px;
  left: 35px;
  z-index: 2;
  background-color: var(--logo-color);
}

.top, .bottom {
  position: absolute;
  background-color: #fff;
  width: 40px;
  height: 20px;
  top: -19px;
  z-index: 3;
}

.top {
  left: 1px;
  transform: skew(-5deg);
  border-top-right-radius: 100% 20px;
  border-top-left-radius: 100% 15px;
}

.bottom {
  right: 1px;
  transform: skew(5deg);
  border-top-left-radius: 100% 20px;
  border-top-right-radius: 100% 15px;
}