*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: 0.5s;
}
header{
    padding-bottom: 3px;
    display: flex;
    justify-content: space-between;
    border-bottom: 2px solid goldenrod;
    background-color: black;
}
ul{
    display: flex;
}
h2{
    margin-top: 7px;
    color: goldenrod;
}
li{
    list-style: none;
    padding: 13px;
}
li a {
    text-decoration: none;
    color: goldenrod;
}
li a:hover {
    font-size: 20px;
    border-bottom: 1px solid goldenrod;
}
section{
    width: 100%;
    height: 400px;
    background-position: center;
    background-attachment: fixed;
}
h1{
    margin-bottom: 21px;
}
.txt{
    background-color: rgb(0, 0, 0);
    border-bottom: 2px solid goldenrod;
    border-top: 2px solid goldenrod;
    height: auto;

}    
p,h1{
    color: goldenrod;
}
h3{
    color: goldenrod;
    font-size: 25px;
}
p{
    font-size: 22px;
    padding-left: 15px;
    padding-top: 18px;
    margin-bottom: 25px;
}
h1{
    font-size: 40px;
}
#img{
    background-image: url(imagens/skyline-255116_1280.jpg);
}

#img2{
    background-image: url(imagens/calculator-g23d25c45e_1920.jpg);
}
#img3{
    background-image: url(imagens/contact-us-1908762_1920.png);
}
#img4{
    background-image: url(imagens/real-estate-6688945_1920.jpg);
}
footer{
    border-top: 2px solid goldenrod;
    display: flex;
    justify-content: space-between;
    padding: 8px;
    background-color: black;
}
.grade{
    display: inline-block;
    border: 1px solid goldenrod;
    width: 20vw;
    margin-bottom: 40px;
    margin-top: 20px;
}
.cell{
    display: inline-block;
    border: 1px solid goldenrod;
    width: 25vw;
    margin-bottom: 40px;
    margin-top: 20px;
}
.cell > h3{
    margin: 15px;
    padding-left: 10px;
}
#cont{
    width: fit-content;
    text-align: center;
    margin: auto;
}
#bt{
    width: 200px;
    height: 20px;
    margin: 0 auto;
}
button{
    background-color: goldenrod;
    width: 120%;
    height: 120%;
}
footer{
    font-style: italic;
    font-weight: lighter;
}
a{
    color: white;
}
#planos{
    height: auto;
}
.gif,#p{
    display: inline-block;
}
#banner{
    width: 60%;
    height: 122px;
    padding-left: 90px;
}
.gif{
    width: 250px;
    float: right;
    padding-bottom: 15px;
}
.gif2{
    width: 250px;
    float: left;
}
@media screen and (max-width: 768px) {
    p,h1,h2,h3,a{
      font-size: 50%;
    }
    section{
        height: 180px;
        background-size: cover;
    }
    h2{
        margin-top: 16px;
    }
    #bt{
        width: 120px;
    }
    button{
        font-size: 80%;
    }
    .cell h3{
        margin-left: 5px;
    }
    .cell p {
        margin-right: 10px;
    }
    footer p{
        font-size: 70%;
    }
    .gif,.gif2{
        width: 74px;
    }
    #banner{
        height: 60%;
    }
  }