body {
    background-image: url('../img/capa.jpg');
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-size: cover;
    background-color: black;    
}

/*Botão*/

.btn{
    color: #FFF;
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn a input{
    width: 150px;
    padding: 12px;
    background-color: #FFF;
    border-radius: 50px;
    font-size: 20px; 
    border: none;
    top:50%;
    left: 50%;
    margin-top: -50px;
    margin-left: -100px;
    position: absolute;
}

.btn a input:hover{
    cursor: pointer;
    box-shadow: inset 0 0 1em rgb(109, 207, 237), 0 0 1em rgb(130, 206, 238);    
}

footer{
    position: fixed;
    bottom: 0;
    width: 100%;
    color: #FFF;
    height: 30px;
    text-align: center;
    padding: 6px;
    background: rgb(61,125,142);
    background: radial-gradient(circle, rgba(61,125,142,1) 3%, rgba(65,65,65,1) 94%);
    margin-top: 10px;
}