body {
    font-family: Arial, sans-serif;
}

/* 1. Cartão Básico */
.cartao-basico {
    width: 250px;
    height: 150px;
    border: 2px solid blue;
    padding: 15px;
    margin-bottom: 30px;
}

/* 2. Botão Flutuante */
.botao-flutuante {
    display: inline-block;
    border-radius: 8px;
    padding: 10px 20px;
    box-shadow: 2px 2px 5px gray;
    border: 1px solid #aaa;
    margin-bottom: 30px;
}

/* 3. Container Centralizado */
.container-centralizado {
    width: 80%;
    min-height: 300px;
    margin: 0 auto;
    border: 1px dashed #000;
    padding: 15px;
    margin-top: 30px;
}

/* 4. Moldura Irregular */
.moldura-irregular {
    border-radius: 5px 50px 5px 50px;
    border: 2px solid #000;
    margin: 10px 20px 30px 40px;
    padding: 10px;
}

/* 5. Bloco com Sombra 3D */
.bloco-3d {
    width: 200px;
    height: 200px;
    border: 5px double #000;
    box-shadow: 8px 8px 0px #000;
    padding: 10px;
    margin-bottom: 30px;
}

/* 6. Resetando margens e bordas */
.resetado {
    padding: 0;
    margin: 0;
    border: none;
}

p.resetado {
    width: 400px;
}

/* 7. Círculo Perfeito */
.circulo {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 2px solid black;
    margin: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 8. Borda 4x */
.borda4x {
    border-left: 5px solid black;
    border-bottom: 2px dotted black;
    border-top: none;
    border-right: none;
    padding-left: 15px;
    margin-bottom: 40px;
}

/* 9. Card com Sombra Interna */
.card-interno {
    width: 250px;
    height: 150px;
    border-radius: 15px;
    border: 2px solid #333;
    box-shadow: inset 0px 0px 15px rgba(0,0,0,0.5);
    margin-top: 50px;
    padding: 15px;
}

/* 10. Duas colunas */
.coluna1, .coluna2 {
    float: left;
    height: 400px;
    border: 1px solid #ccc;
    padding: 10px;
}

.coluna1 {
    width: 30%;
}

.coluna2 {
    width: 70%;
}