body {
    color: white;
    background-color: black;
    font-family: Arial, Helvetica, sans-serif;
}

ul {
    display: flex;
    justify-content: space-between;
    list-style-type: none;
    align-items: center;
    padding: 16px;
}

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

header img {
    width: 100%;
    height: 50%;
    border-radius: 0%;
    border: 2px solid #5BBE42;
}

.center {
    text-align: center;
}

h1 {
    color: #5BBE42;
}

footer img {
    width: 40px;
    height: 40px;
}

footer {
    display: flex;
    justify-content: center;
}

footer a {
    margin: 20px;
    text-align: center;
}

footer p {
    margin-top: 2px;
}

.container {
    padding: 0px 0px;
}
                              <!-- .container font-size: 200%; exemplo-->
nav a {
    font-size: 20px;
}

nav a:hover {
    color: #5BBE42;
}

.contact-form input{
    width: 100%;
    padding: 8px 0;
    margin: 8px 0;
}

.contact-form input[type=text] {
    height: 100px;
}

button {
    color: black;
    background-color: white;
    border: none;
    width: 100px;
    height: 30px;
}

 .btn {
    margin: 0px;
    padding: 15px 40px;
    border: none;
    outline: none;
    color: #FFF;
    cursor: pointer;
    position: relative;
    z-index: 0;
    border-radius: 12px;
  }
  .btn::after {
    content: "";
    z-index: -1;
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: #120303;
    left: 0;
    top: 0;
    border-radius: 10px;
  }
  
  .btn::before {
    content: "";
    background: linear-gradient(
      45deg,
      #FF0000, #FF7300, #FFFB00, #48FF00,
      #00FFD5, #002BFF, #FF00C8, #FF0000
    );
    position: absolute;
    top: -2px;
    left: -2px;
    background-size: 600%;
    z-index: -1;
    width: calc(100% + 4px);
    height:  calc(100% + 4px);
    filter: blur(8px);
    animation: glowing 20s linear infinite;
    transition: opacity .3s ease-in-out;
    border-radius: 10px;
    opacity: 0;
  }
  
  @keyframes glowing {
    0% {background-position: 0 0;}
    50% {background-position: 400% 0;}
    100% {background-position: 0 0;}
  }
  
 
  .btn:hover::before {
    opacity: 1;
  }
  
  .btn:active:after {
    background: transparent;
  }
  
  .btn:active {
    color: #000;
    font-weight: bold;
  }

.relogio{
	justify-content: space-around;
	padding: 2em;
}
.aba-conteudo.ativo{
	display:block;
}
.aba-conteudo{
	display: none;
}
.aba-conteudo-titulo-principal{
	font-size: 28px;
	text-align: center;
}
.aba-conteudo-titulo-secundario{
	text-align: center;
	text-transform: uppercase;
}
.contador{
	display:flex;
	justify-content: center;
	flex-wrap: wrap;
}
.contador-digito {
	padding: 10  26px;
	text-align: center;
	min-width: 100px;
}
.contador-digito-numero{
	font-size: 50px;
	margin: 0;
}
.contador-digito-texto{
	font-size: 20px;
	margin: 0;
}