style.css

*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    color: #a09038;
    font-family: 'Poppins', sans-serif;
}
ul{
    list-style: none;
    font-style: italic;
    font-weight: 700;
}
a{
    text-decoration: none;
}
body{
    background: url(./img/pexels-cut.jpg) no-repeat center center fixed;
    background-size: cover; 
}
header{
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid white ;
    margin-bottom: 50px;
    border-color: #a09038;
}
header ul{
    display: flex;
}
header ul li{
    padding: 5px;
}
header ul li a{
    transition: 300ms;
}
header ul li a:hover{
    color: #c0a717;
    text-decoration: underline;
}
.container{
    text-align: center;
}
.container .nome h1{
    font-size: 60px;
}
.container .nome h5{
    font-size: 25px;
}
#arrow{
    font-size: 35px;
    animation: blink 1s steps(5, start) infinite;
}
#arrow i {
    cursor: pointer;
}
@keyframes blink {
    to {
        visibility: hidden;
    }
}
#animation{
    transition: 300ms;
}
.rotate{
    transform: rotate(180deg);
    transition: 300ms
}
.active{
    display: block !important;
}
#sobre p{
    max-width: 800px;
    margin: 0 auto;
}
.form{
    width: 40%;
    margin: 0 auto;
    margin-top: 30px;
}
.form input{
    width: 50%;
    padding: 5px 10px;
    border: none;
    border-radius: 5px 0px 0px 5px;
}
.form button{
    width: 15%;
    padding: 5px 10px;
    background: linear-gradient(to right, #c0a717 50%, #9c551b 50%);
    background-size: 200% 100%;
    background-position: right bottom;
    color: #FFF;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 300ms ease-out;
    border-radius: 0px 5px 5px 0px;
    margin-top: 20px;
    margin-left: -5px;
}
.form button:hover{
    background-position: left bottom;
}
@media only screen and (max-width: 480px) {
    .form{
        width: 100%;
    }
}
@media only screen and (max-width: 480px) {
    .container .nome h1 {
        font-size: 30px;
    }

    .container .nome h5 {
        font-size: 15px;
    }

    #sobre p {
        max-width: 80%;
    }

    #arrow i {
        font-size: 25px;
        text-align: justify;
    }
}
/* box-sizing: border-box - faz com q o conteudo dentro do box se contente dentro da sua box, 
qnd tiver width e hight, a soma deles seja apenas eles */
/* back-url - cobrir toda a tela, fixado e sem repetir */