*{box-sizing: border-box;}

main{
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

header{
    color: black;
    text-align: center;
}

nav{
    float: right;
}

nav ul{
    list-style-type: none;
}
nav ul li{
    display: inline-block;
}

nav ul li a{
  text-decoration: none;
  color: black;
  text-align: center;
  width: 200px;
  display: block;
  padding-right: 1.5em;
  font-size: 20px;
  font-weight: bold;
}

.product-grid{
    display: grid;
    grid: auto / repeat(4, 1fr);
    grid-gap: 40px 20px;
}

.grid-item{
    justify-self: center;
    align-self: center;
    text-align: center;
}

main img{
    height: 150px;
    width: 150px;
}

.button a{
    background-color: #4f6ae6;
    border-radius: 0px;
    color: #fff;
    display: inline-block;
    font-size: 16px;
    font-weight: 500;
    line-height: 0.8px;
    text-transform: uppercase;
    min-width: 170px;
    padding: 20px 15px;
    border-radius: 30px;
    margin: 5% 0;
    text-align: center;
    text-decoration: none;
}

.about-me img{
    height: 300px;
    width: 300px;
}

footer{
    text-align: center;
}

@media only screen and (max-width: 1024px){
    main{
        font-family: Verdana, Geneva, Tahoma, sans-serif;
    }
    
    header{
        color: black;
        text-align: center;
    }
    
    nav{
        float: right;
    }
    
    nav ul{
        list-style-type: none;
    }
    nav ul li{
        display: inline-block;
    }
    
    nav ul li a{
      text-decoration: none;
      color: black;
      text-align: center;
      width: 200px;
      display: block;
      padding-right: 1.5em;
      font-size: 20px;
      font-weight: bold;
    }
    
    .product-grid{
        display: grid;
        grid: auto / repeat(4, 1fr);
        grid-gap: 40px 20px;
    }
    
    .grid-item{
        justify-self: center;
        align-self: center;
        text-align: center;
    }
    
    main img{
        height: 150px;
        width: 150px;
    }
    
    .button a{
        background-color: #4f6ae6;
        border-radius: 0px;
        color: #fff;
        display: inline-block;
        font-size: 16px;
        font-weight: 500;
        line-height: 0.8px;
        text-transform: uppercase;
        min-width: 170px;
        padding: 20px 15px;
        border-radius: 30px;
        margin: 5% 0;
        text-align: center;
        text-decoration: none;
    }
    
    .about-me img{
        height: 300px;
        width: 300px;
    }
    
    footer{
        text-align: center;
    }
}

@media only screen and (max-width :768px){
    main{
        font-family: Verdana, Geneva, Tahoma, sans-serif;
    }
    
    header{
        color: black;
        text-align: center;
    }
    
    nav{
        float: right;
    }
    
    nav ul{
        list-style-type: none;
    }
    nav ul li{
        display: inline-block;
    }
    
    nav ul li a{
      text-decoration: none;
      color: black;
      text-align: center;
      width: 200px;
      display: block;
      padding-right: 1.5em;
      font-size: 20px;
      font-weight: bold;
    }
    
    .product-grid{
        display: grid;
        grid: auto / repeat(4, 1fr);
        grid-gap: 40px 20px;
    }
    
    .grid-item{
        justify-self: center;
        align-self: center;
        text-align: center;
    }
    
    main img{
        height: 150px;
        width: 150px;
    }
    
    .button a{
        background-color: #4f6ae6;
        border-radius: 0px;
        color: #fff;
        display: inline-block;
        font-size: 16px;
        font-weight: 500;
        line-height: 0.8px;
        text-transform: uppercase;
        min-width: 170px;
        padding: 20px 15px;
        border-radius: 30px;
        margin: 5% 0;
        text-align: center;
        text-decoration: none;
    }
    
    .about-me img{
        height: 300px;
        width: 300px;
    }
    
    footer{
        text-align: center;
    }
}