纯css实现的一些好看的按钮

<button>
    Click me
</button>

button {
  --bg: #e74c3c;
  --text-color: #fff;
  position: relative;
  width: 150px;
  border: none;
  background: var(--bg);
  color: var(--text-color);
  padding: 1em;
  font-weight: bold;
  text-transform: uppercase;
  transition: 0.2s;
  border-radius: 5px;
  opacity: 0.8;
  letter-spacing: 1px;
  box-shadow: #c0392b 0px 7px 2px, #000 0px 8px 5px;
}
button:hover {
  opacity: 1;
}
button:active {
  top: 4px;
  box-shadow: #c0392b 0px 3px 2px,#000 0px 3px 5px;
}

<button>
  <span>PLAY NOW</span>
</button>

button {
 border: none;
 position: relative;
 width: 200px;
 height: 73px;
 padding: 0;
 z-index: 2;
 -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' height='868' width='2500' viewBox='0 0 726 252.17'%3E%3Cpath d='M483.92 0S481.38 24.71 466 40.11c-11.74 11.74-24.09 12.66-40.26 15.07-9.42 1.41-29.7 3.77-34.81-.79-2.37-2.11-3-21-3.22-27.62-.21-6.92-1.36-16.52-2.82-18-.75 3.06-2.49 11.53-3.09 13.61S378.49 34.3 378 36a85.13 85.13 0 0 0-30.09 0c-.46-1.67-3.17-11.48-3.77-13.56s-2.34-10.55-3.09-13.61c-1.45 1.45-2.61 11.05-2.82 18-.21 6.67-.84 25.51-3.22 27.62-5.11 4.56-25.38 2.2-34.8.79-16.16-2.47-28.51-3.39-40.21-15.13C244.57 24.71 242 0 242 0H0s69.52 22.74 97.52 68.59c16.56 27.11 14.14 58.49 9.92 74.73C170 140 221.46 140 273 158.57c69.23 24.93 83.2 76.19 90 93.6 6.77-17.41 20.75-68.67 90-93.6 51.54-18.56 103-18.59 165.56-15.25-4.21-16.24-6.63-47.62 9.93-74.73C656.43 22.74 726 0 726 0z'/%3E%3C/svg%3E") no-repeat 50% 50%;
 mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' height='868' width='2500' viewBox='0 0 726 252.17'%3E%3Cpath d='M483.92 0S481.38 24.71 466 40.11c-11.74 11.74-24.09 12.66-40.26 15.07-9.42 1.41-29.7 3.77-34.81-.79-2.37-2.11-3-21-3.22-27.62-.21-6.92-1.36-16.52-2.82-18-.75 3.06-2.49 11.53-3.09 13.61S378.49 34.3 378 36a85.13 85.13 0 0 0-30.09 0c-.46-1.67-3.17-11.48-3.77-13.56s-2.34-10.55-3.09-13.61c-1.45 1.45-2.61 11.05-2.82 18-.21 6.67-.84 25.51-3.22 27.62-5.11 4.56-25.38 2.2-34.8.79-16.16-2.47-28.51-3.39-40.21-15.13C244.57 24.71 242 0 242 0H0s69.52 22.74 97.52 68.59c16.56 27.11 14.14 58.49 9.92 74.73C170 140 221.46 140 273 158.57c69.23 24.93 83.2 76.19 90 93.6 6.77-17.41 20.75-68.67 90-93.6 51.54-18.56 103-18.59 165.56-15.25-4.21-16.24-6.63-47.62 9.93-74.73C656.43 22.74 726 0 726 0z'/%3E%3C/svg%3E") no-repeat 50% 50%;
 -webkit-mask-size: 100%;
 cursor: pointer;
 background-color: transparent;
 transform: translateY(8px)
}
button:after {
 content: '';
 position: absolute;
 left: 0;
 right: 0;
 bottom: 0;
 box-shadow: 0px 0 0 0 white;
 transition: all 2s ease;
}
button:hover:after {
 box-shadow: 0px -13px 56px 12px #ffffffa6;
}
button span {
 position: absolute;
 width: 100%;
 font-size: 15px;
 font-weight: 100;
 left: 50%;
 top: 39%;
 letter-spacing: 3px;
 text-align: center;
 transform: translate(-50%,-50%);
 color: black;
 transition: all 2s ease;
}
button:hover span {
 color: white;
}
button:before {
 content: '';
 position: absolute;
 width: 0;
 height: 100%;
 background-color: black;
 left: 50%;
 top: 50%;
 transform: translate(-50%, -50%);
 transition: all 1s ease;
}
button:hover:before {
 width: 100%;
}

<button class="button">
  <svg viewBox="0 0 448 512" class="svgIcon"><path d="M135.2 17.7L128 32H32C14.3 32 0 46.3 0 64S14.3 96 32 96H416c17.7 0 32-14.3 32-32s-14.3-32-32-32H320l-7.2-14.3C307.4 6.8 296.3 0 284.2 0H163.8c-12.1 0-23.2 6.8-28.6 17.7zM416 128H32L53.2 467c1.6 25.3 22.6 45 47.9 45H346.9c25.3 0 46.3-19.7 47.9-45L416 128z"></path></svg>
</button>

.button {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: rgb(20, 20, 20);
  border: none;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.164);
  cursor: pointer;
  transition-duration: .3s;
  overflow: hidden;
  position: relative;
}
.svgIcon {
  width: 12px;
  transition-duration: .3s;
}
.svgIcon path {
  fill: white;
}
.button:hover {
  width: 140px;
  border-radius: 50px;
  transition-duration: .3s;
  background-color: rgb(255, 69, 69);
  align-items: center;
}
.button:hover .svgIcon {
  width: 50px;
  transition-duration: .3s;
  transform: translateY(60%);
}
.button::before {
  position: absolute;
  top: -20px;
  content: "Delete";
  color: white;
  transition-duration: .3s;
  font-size: 2px;
}
.button:hover::before {
  font-size: 13px;
  opacity: 1;
  transform: translateY(30px);
  transition-duration: .3s;
}