*,
*::before,
*::after {
    padding: 0;
    margin: 0;
    box-sizing: inherit;
}

html {
    font-size: 62.5%;
}

body {
    font-family: 'Open Sans', sans-serif;
    font-weight: 400;
    line-height: 1.3;
    background-color: #333; 
    color: #aeaeae;
    box-sizing: border-box;
}

.header { 
    margin: 0 auto;
    background-image: url('../images/gif.gif'); 
    background-repeat: repeat;
    background-position: center; 
    background-color: #333;
    width: 50vw;
    margin-top: 5rem;
}

  @media only screen and (max-width: 75em) {
.header {
    width: 60vw;}
}

 @media (max-width: 56.25em) {
    .header {
        width: 60rem;
        margin-top: 7rem;}
}

  @media only screen and (max-width: 47.5em) {
.header {
    width: 80vw;
    margin-top: 8rem;
}
}

  @media only screen and (max-width: 30em) {
    .header {
        width: 100vw;
        margin-top: 10rem;
    }
}

.nav__item {
    list-style: none;
    padding: 0 2.5rem;
}

 @media only screen and (max-width: 30em) {
    .nav__item {
        padding: 0 2rem;  
    }
}

.nav__list {
    display: flex;
    justify-content: center;
    margin-top: -7rem;
}

 @media (max-width: 56.25em) {
    .nav__list {
        margin-top: -6rem;}
}


  @media only screen and (max-width: 47.5em) {
    .nav__list {
        margin-top: -5rem;}
    }

  @media only screen and (max-width: 30em) {
    .nav__list {
        margin-top: -4rem;}
    }


.nav__item {
    transition: transform .3s ease-in-out;
}

.nav__item:hover {
    transform: scale(1.5);
}