alura-aula1.css

body{
    background-image: url(https://exame.com/wp-content/uploads/2016/10/thinkstockphotos-489956624.jpg);
    background-size: cover;
    background-position: center bottom;
    background-repeat: no-repeat;
    font-family: 'Roboto Mono',monospace;
    min-height: 400px;
    margin-left: auto;
    margin-right: auto 
}

.caixa{
    width: 400px;
    background: #131417a6;
    padding: 10px;
    position: relative;
    border-radius: 15px 0 15px 0;
    border: 2px solid Burlywood;
  }

.logo-principal { /*logo alura azul*/
    width: 50px; /* logo no canto superior*/
    position: absolute;
    right: 5%;
    top: 10px;
    float: right;
    display: inline;
    padding: 3.5%;
}

.logo-secundario {
    width: 150px;
    position: absolute;
    padding: 5px;
    top: 100px;
    left: 45%;
}

.bloco-principal{
    padding: 20px;
    text-align: center;
    color: white;
    font-size: 20px;
    height: 100vh;
}

p{
    padding: 25px;
    margin-top: 5px
}

.cotacao{
    position: absolute;
    color: white;
    font-size: 18px;
    text-align: center;
    font-weight: 300;
    top: 52%;
    left: 35%;
    padding: 20px;
}

.caixa{
    padding: 15px;
    text-align: center;
    position: absolute;
    display: block;
    top: 30%;
    left: 35%;
}

input{
    display: inline-block;
    width: 66%;
    height: 50%;
    margin: 3px 0 15px;
    outline: none!important;
    padding: 0 25px;
    font-size: 18px;
    align-items: center;
    border: 2px solid;
    border-color: white;
    border-radius: 15px;
    
}

button{
    box-sizing: border-box;
    background-color: transparent;
    color: white;
    border-color: white;
    display: inline-block;
    position: relative;
    border-style: solid;
    font-weight: 700;
    border-radius: 15px;
    width: 35%;
    height: 50%;
    cursor: pointer;
 
}

button:hover{
    color: gold;
    border-color: gold;
}

span{
    text-align: center;
    width: 35%;
    padding: 10px;
    display: block;
    position: relative;
    font-size: 18px;
    top: 30%;
    left: 30%;
    color:gold;
    font-weight: 900;
}