html {
    background: #ffffff;
    -webkit-font-smoothing: antialiased;
}

body {
    background: #fff;
    color: #848484;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    margin: 0 auto;
    max-width: 1000px;
    padding: 0px;
}

h1, h2, h3, h4, h5, h6 {
    color: #545454;
    font-weight: 600;
    line-height: 1.3;
}

h2 {
    margin-top: 1.3em;
}

a {
    color: #0083e8;
}

b, strong {
    font-weight: 600;
}

img {
    animation: colorize 2s cubic-bezier(0, 0, .78, .36) 1;
    background: transparent;
}

@keyframes colorize {
    0% {
        -webkit-filter: grayscale(100%);
        filter: grayscale(100%);
    }
    100% {
        -webkit-filter: grayscale(0%);
        filter: grayscale(0%);
    }
}

@-webkit-keyframes cf4FadeInOut {
 0% {
   opacity:1;
 }
 17% {
   opacity:1;
 }
 25% {
   opacity:0;
 }
 92% {
   opacity:0;
 }
 100% {
   opacity:1;
 }
}

@-moz-keyframes cf4FadeInOut {
 0% {
   opacity:1;
 }
 17% {
   opacity:1;
 }
 25% {
   opacity:0;
 }
 92% {
   opacity:0;
 }
 100% {
   opacity:1;
 }
}

@-o-keyframes cf4FadeInOut {
 0% {
   opacity:1;
 }
 17% {
   opacity:1;
 }
 25% {
   opacity:0;
 }
 92% {
   opacity:0;
 }
 100% {
   opacity:1;
 }
}

@keyframes cf4FadeInOut {
 0% {
   opacity:1;
 }
 17% {
   opacity:1;
 }
 25% {
   opacity:0;
 }
 92% {
   opacity:0;
 }
 100% {
   opacity:1;
 }
}

#cf4a {
  position: relative;
  margin:0 auto;
    height: 400px;
}
#cf4a img {
  position:absolute;
  left:0;
}

#cf4a img {
  -webkit-animation-name: cf4FadeInOut;
  -webkit-animation-timing-function: ease-in-out;
  -webkit-animation-iteration-count: infinite;
  -webkit-animation-duration: 15s;

  -moz-animation-name: cf4FadeInOut;
  -moz-animation-timing-function: ease-in-out;
  -moz-animation-iteration-count: infinite;
  -moz-animation-duration: 45s;

  -o-animation-name: cf4FadeInOut;
  -o-animation-timing-function: ease-in-out;
  -o-animation-iteration-count: infinite;
  -o-animation-duration: 45s;

  animation-name: cf4FadeInOut;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-duration: 45s;
}
#cf4a img:nth-of-type(1) {
  -webkit-animation-delay: 30s;
  -moz-animation-delay: 30s;
  -o-animation-delay: 30s;
  animation-delay: 30s;
}
#cf4a img:nth-of-type(2) {
  -webkit-animation-delay: 15s;
  -moz-animation-delay: 15s;
  -o-animation-delay: 15s;
  animation-delay: 15s;
}
#cf4a img:nth-of-type(3) {
  -webkit-animation-delay: 0s;
  -moz-animation-delay: 0s;
  -o-animation-delay: 0s;
  animation-delay: 0s;
}

a{
  text-decoration: none;
  color: burlywood;
}

.underline{
  position: relative;
}

.underline::before{
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 0;
  height: 1px;
  background-color: burlywood;
  transition: width 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

@media (hover: hover) and (pointer: fine) {
  .underline:hover::before{
    left: 0;
    right: auto;
    width: 100%;
  }
}

div.button {
    position:absolute;
    cursor:pointer;
    left: 50px;
    width: 200px;
    height: 40px;
    background-color: #545454;
    color: white;
    text-align: center;
    vertical-align: middle;
    line-height: 40px;
    box-shadow:
		0 1px 2px rgba(0,0,0,0.07), 
		0 2px 4px rgba(0,0,0,0.07), 
		0 4px 8px rgba(0,0,0,0.07), 
		0 8px 16px rgba(0,0,0,0.07),
		0 16px 32px rgba(0,0,0,0.07), 
		0 32px 64px rgba(0,0,0,0.07);
}

div.button:hover {
    background-color: dimgrey;
}