body {
    background-color: #404040;
}
h1 {
    font-family: arial, sans-serif;
    text-align: center;
    font-size: 60px;
    color: white;
	
}
.box {
    width: 400px;
    height: 150px;
    background: rgb(31,31,31);
    position: relative;
    margin-left: auto;
    margin-right: auto;
}

.box::before,
.box::after {
    content:'';
    position: absolute;
    top: 0;
    left: 0;
    background: linear-gradient(45deg, 
    #ff0000, #00f0f0, #00ff00, #0000ff,
    #ff0000, #00f0f0, #00ff00, #0000ff,
    #f00f0f);
    width: 100%;
    height: 100%;
    background-size: 500%;
    z-index: -1;
    transform: scale(1.02);
    animation: animate 20s infinite;
}
.box::after {
    filter: blur(20px);
}

@keyframes animate {
  0% { 
      background-position: 0 0; 
	 }
  50% { 
      background-position: 300% 0; 
	 }
  100% { 
      background-position: 0 0; 
	 }
}
.lien {
    right: -530px;
    top: 50px;
    width: 200px;
    height: 60px;
    font-size: 1.3rem;
    font-family: arial, sans-serif;
    font-weight: 700;
    position: relative;
    color: white;
    z-index: 0;
    border: 1px solid #77d5d5;
    background: black;
    overflow: hidden;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
}
.lien::before {
    content: '';
    position: absolute;
    top: 60px;
    left: 0;
    width: 100%;
    height: 100%;
    background: #77d5d5;
    border-radius: 50% 50% 0% 0%;
    z-index: -1;
    transition: all .5s;
}
.lien:hover::before {
    top: 0px;
    border-radius: 0;
}
img {
	display: block;
	margin: auto;
	margin-right: 0px;
}