style.css

*{
    margin: 0;
    padding: 0;
}

.main{
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.contain_img{
    width: 10rem;
    height:10rem;
    margin: 0.5rem;
}

.img{
    height: 100%;
    width: 100%;
    object-fit: cover;
    filter: grayscale(50%);
}

header{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0.5rem;
    background-color: #b2e2f2;
}

header h1{
    font-size: xxx-large;
}

header h3{
    margin-top: 0.5rem;
    font-size: xx-large;
}

header div{
    margin-top: 0.5rem;
}

.btn_amount{
    height: 1.5rem;
    width: 5rem;
    margin: 0.5rem;
    border-radius: 10px;
}

.section_input{
    display: flex;
    padding: 0.5rem;
    justify-content: center;
    align-items: center;
    background-color: #b2e2f2;
    margin-bottom: 0.5rem;
}

.section_input input{
    margin: 0.5rem;
    width: 8rem;
    height: 1.5rem;
}