body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background-image: url(./assets/img/background_login.png);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-box {
  width: 460;
  padding: 30px;
  background-color: rgba(0,0,0,0.30);
  box-sizing: border-box;
  -webkit-box-shadow: 0px 0px 5px 1px rgba(26,50,177,0.7);
-moz-box-shadow: 0px 0px 5px 1px rgba(26,50,177,0.7);
box-shadow: 0px 0px 5px 1px rgba(26,50,177,0.7);
  border-radius: 30px;
}

.login-box h2 {
  margin: 0 0 20px;
  padding: 0;
  font-size: 20px;
  color: #f5f5f5;
  text-align: center;
}

.login-box h3 {
  margin: 0 0 10px;
  padding: 0;
  font-family: Helvetica, sans-serif;
  font-size: 40px;
  color: #f5f5f5;
  text-align: center;
}

.login-box h4 {
  margin: 0 0 15px;
  padding: 0;
  font-family: Helvetica, sans-serif;
  font-size: 15px;
  color: #f5f5f5;
  text-align: center;
}

.login-box .user-box {
  position: relative;
}

.login-box .user-box input {
  width: 100%;
  padding: 16px;
  font-size: 17px;
  color: #1A32B1;
  margin-bottom: 20px;
  border: none;
  border-bottom: 3px solid #ffffff;
  border-radius: 25px;
  background: #f3f3f3;
}
.login-box .user-box label {
  position: absolute;
  top:0;
  left: 0;
  padding: 10px 0;
  font-size: 16px;
  color: #ffffff;
  pointer-events: none;
  transition: .5s;
}

.login-box .user-box input:focus ~ label,
.login-box .user-box input:active ~ label{
  top: -20px;
  left: 0;
  color: #03f411;
  font-size: 12px;
}

.button {
  position: relative;
  display: inline-block;
  padding: 10px 20px;
  color: #e7e7e7;
  font-size: 16px;
  font-family: Verdana;
  text-decoration: none;
  text-transform: uppercase;
  overflow: hidden;
  transition: .5s;
  margin-top: 40px;
  letter-spacing: 4px
}

.login-box form a {
  position: relative;
  display: inline-block;
  padding: 10px 20px;
  color: #21f403;
  font-size: 16px;
  text-decoration: none;
  text-transform: uppercase;
  overflow: hidden;
  transition: .5s;
  margin-top: 40px;
  letter-spacing: 4px
}

.login-box a:hover {
  background: #03e9f4;
  color: #fff;
  border-radius: 5px;
  box-shadow: 0 0 5px #03f41a,
              0 0 25px #49f403,
              0 0 50px #03f421,
              0 0 100px #03f427;
}

.login-box a span {
  position: absolute;
  display: block;
}

.login-box a span:nth-child(1) {
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, #00d462, #6ef403);
  animation: btn-anim1 1s linear infinite;
}

@keyframes btn-anim1 {
  0% {
    left: -100%;
  }
  50%,100% {
    left: 100%;
  }
}

.login-box a span:nth-child(2) {
  top: -100%;
  right: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, transparent, #03f407);
  animation: btn-anim2 1s linear infinite;
  animation-delay: .25s
}

@keyframes btn-anim2 {
  0% {
    top: -100%;
  }
  50%,100% {
    top: 100%;
  }
}

.login-box a span:nth-child(3) {
  bottom: 0;
  right: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(270deg, white, #c3c3c3);
  animation: btn-anim3 1s linear infinite;
  animation-delay: .5s
}

@keyframes btn-anim3 {
  0% {
    right: -100%;
  }
  50%,100% {
    right: 100%;
  }
}

.login-box a span:nth-child(4) {
  bottom: -100%;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(360deg, gainsboro, #43f403);
  animation: btn-anim4 1s linear infinite;
  animation-delay: .75s
}

@keyframes btn-anim4 {
  0% {
    bottom: -100%;
  }
  50%,100% {
    bottom: 100%;
  }
}