😄Hiệu ứng đẹp dùng ngày cho website (ok)

Example 1: https://codepad.co/snippet/glowing-effect

<div class="line"></div>

html, body {
  height: 100%;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #B24592;
  background: linear-gradient(to left, #B24592 , #F15F79);
}

.line {
  position: relative;
  width: 400px;
  height: 10px;
  background: rgba(255, 255, 255, .1);
  
  &:before {
    animation: progress-1 4s infinite;
    transform-origin: 0 0;
    content: "";
    display: block;
    width: 400px;
    height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0.1) 10%, rgba(255,255,255,0.4) 80%, rgba(255,255,255,1));
  }
  
  &:after {
    content: "";
    position: absolute;
    animation: progress-2 4s infinite;
    transform-origin: 90% 50%;
    margin-left: -24px;
    top: -9px;
    width: 40px;
    height: 21px;
    border-radius: 2px;
    background: rgba(210,189,255,.55);
    filter: blur(8px);
    box-shadow: 0 0 10px 6px rgba(210,189,255,.4),
                -20px 0 15px 4px rgba(210,189,255,.3),
                -40px 0 15px 2px rgba(210,189,255,.2),
                -60px 0 10px 1px rgba(210,189,255,.1),
                -80px 0 10px 1px rgba(210,189,255,.05);
  }
}

@keyframes progress-1 {
  0% {
    transform: scalex(0);
    opacity: .5;
  }
  90% {
    transform: scalex(1);
    opacity: 1;
  }
  92% {
    transform: scalex(1);
    opacity: 1;
  }
  100% {
    transform: scalex(1);
    opacity: 0;
  }
}

@keyframes progress-2 {
  0% {
    transform: scale(.3,.8) translatez(0);
    opacity: 0;
  }
  90% {
    transform: scale(1,1) translatex(400px) translatez(0);
    opacity: 1;
  }
  100% {
    transform: scale(1,1) translatex(400px) translatez(0);
    opacity: 0;
  }
}

Example 2: Minimal-buttons-smooth-hover-effect

https://codepad.co/snippet/minimal-buttons-smooth-hover-effect

<div class="wrapper">
  <div class='button button__one'>
    Hover Me!
  </div>
  <div class='button button__two'>
    Hover Me Too!
  </div>    
</div>

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: #ddd6f3;
  background: linear-gradient(to left, #E55D87 , #5FC3E4);
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  font-family: sans-serif;
  font-weight: 100;
  font-size: 20px;
}

.wrapper {
  display: flex;
  flex-direction: column;
}

.button {
  position: relative;
  color: #444;
  display: inline-block;
  height: 60px;
  line-height: 60px;
  text-align: center;
  transition: 0.5s;
  padding: 0 20px;
  cursor: pointer;
  border: 2px solid #444;
  margin-bottom: 20px;
}

.button:hover {
  border: 2px solid rgba(0,160,80,0);
  color: #FFF;
}

.button::before, .button::after {
  width: 100%;
  height:100%;
  z-index: 3;
  content:'';
  position: absolute;
  top:0;
  left:0;
  box-sizing: border-box;
  transform: scale(0);
  transition: 0.5s;
}

.button__one::before {
  border-bottom: 3px solid #FFF;
  border-left: 3px solid #FFF;
  transform-origin: 0 100%;
}

.button__one::after {
  border-top: 3px solid #FFF;
  border-right: 3px solid #FFF;
  transform-origin: 100% 0%;
}


.button__two::before {
  border-bottom: 3px solid #FFF;
  border-left: 3px solid #FFF;
  transform-origin: 100% 0%;
}

.button__two::after {
  border-top: 3px solid #FFF;
  border-right: 3px solid #FFF;
  transform-origin: 0% 100%;
}

.button:hover::after, .button:hover::before {
  transform: scale(1);
}