*{
    padding: 0;
    margin: auto;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

header{
    padding: 20px 10px 10px 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    color: white;
    background-color: #5e5e5f;
    box-shadow: 0 2px 4px 0 rgba(0,0,0,.2);
}
#primera{
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-width: 400px;
    padding: 50px;
}
form input {
    width: 100%;
    height: 40px;
    border-radius: 8px;
    outline: none;
    border: 2px solid #c4c4c4;
    padding: 0 30px;
    box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}
#btn{
    margin-top: 15px;
    width: 100%;
    height: 45px;
    background-color: #5e5e5f;
    border: 2px solid #5e5e5f;
    border-radius: 8px;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    transition: all 0.1s ease;
}
#btn:hover{
    opacity: 0.8;
}