body {
    margin:50px;
}

label{
  font-size: 20px;
}
h2{
    font-size: 75px;
}

.container-mt-5{
  text-shadow: 3px 3px 5px white;
  font-size: 20px;
  font-weight: bold;
}

.bg {
  animation:slide 3s ease-in-out infinite alternate;
  background-image: linear-gradient(-60deg, #6c3 50%, #09f 50%);
  bottom:0;
  left:-50%;
  opacity:.5;
  position:fixed;
  right:-50%;
  top:0;
  z-index:-1;
}
  
  .bg2 {
    animation-direction:alternate-reverse;
    animation-duration:4s;
  }
  
  .bg3 {
    animation-duration:5s;
  }
  
  .content {
    background-color:rgba(255,255,255,.8);
    border-radius:.25em;
    box-shadow:0 0 .25em rgba(0,0,0,.25);
    
    left:50%;
    padding:10vmin;
    position:fixed;
    text-align:center;
    top:50%;
    transform:translate(-50%, -50%);
  }
  
  
  
  @keyframes slide {
    0% {
      transform:translateX(-25%);
    }
    100% {
      transform:translateX(25%);
    }
  }
  *, *::before, *::after {
    box-sizing: border-box;
}

.btn {
    background-color: var(--background-color);
    color: white;
    padding: .5em 1rem;
    border-radius: 10px;
    outline: none;
    position: relative;
    cursor: pointer;
    border:  solid 3px black;
    
    --background-color: blue;
    --border-size: 2px;
    --accent-color: #0AF;
}


.btn.btn-primary::before {
    content: '';
    position: absolute;
   border-radius: 7px;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: -1;
    background-image: linear-gradient(to right ,#00aeff,yellow);




    transition: transform 300ms ease-in-out;
    transform: scaleX(0);
    transform-origin: left;
}


.btn.btn-primary:hover::before,
.btn.btn-primary:focus::before {
    transform: scaleX(1);
}


.btn.btn-primary{
    transition: color 300 ms ease-in-out;
    z-index: 1;
}


.btn.btn-primary:hover,
.btn.btn-primary:focus {
    color: black;
}