main.css

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    text-decoration: none;
    list-style-type: none;
    letter-spacing: 4px;
    font-size: 20px;
}

html,
body {
    width: 100%;
    height: 100%;
    background-color: #a98e7c;
    color: #ddd;
}

.container {
    margin: 0 auto;
    width: 700px;
}

h1.title {
    text-align: center;
    margin-top: 30px;
    font-size: 18px;
}

.info {
    margin: 0 auto;
    margin-top: 30px;
    width: 70%;
}

.info li {
    list-style-type: circle;
    font-size: 14px;
    line-height: 2;
}

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

.prod-name {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 30px 0;
    margin: 20px 30px;
    width: 30%;
}

.mask-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 30px 0;
    margin: 20px 0;
    width: 40%;
}

.desc {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    margin: 20px 0 20px 70px;
    width: 30%;
    font-size: 16px;
    text-align: left;
}

.source {
    text-align: center;
    padding: 20px;
}

.source a {
    letter-spacing: 1.8px;
    color: #ddd;
}

.link {
    font-size: 10px;
}

/* mask */
.mask {
    position: relative;
    width: 200px;
    height: 90px;
    background-color: #87f0df;
    border: 3px dotted #eee;
    border-top: 4px solid #eee;
    border-radius: 2px;
    transition: all 0.7s;
}

.mask:hover {
    transform: translate(0, -5px);
    box-shadow: 0px 20px 10px rgba(0, 0, 0, 0.4);
}

.mask .iron-line {
    margin: 6px auto;
    width: 190px;
    border: 2px solid #eee;
}

.mask .line {
    margin: 20px auto;
    width: 190px;
    border: 1px solid #eee;
}

.mask::before {
    content: "";
    display: block;
    width: 50px;
    height: 80px;
    position: absolute;
    border: 2px solid #eee;
    border-right: 2px dotted #eee;
    left: -50px;
    border-radius: 40px 0px 0px 40px;
}

.mask::after {
    content: "";
    display: block;
    width: 50px;
    height: 80px;
    position: absolute;
    border: 2px solid #eee;
    border-left: 2px dotted #eee;
    top: 0;
    right: -50px;
    border-radius: 0px 40px 40px 0px;
}

/* carbon */
.carbon-mask {
    position: relative;
    width: 200px;
    height: 90px;
    background-image: radial-gradient(#778683 70%, #aab3b2 30%);
    background-size: 2px 2px;
    border: 3px dotted #ddd;
    border-top: 4px solid #ddd;
    border-radius: 2px;
    transition: all 0.7s;
}

.carbon-mask:hover {
    transform: translate(0, -5px);
    box-shadow: 0px 20px 10px rgba(0, 0, 0, 0.4);
}

.carbon-mask .iron-line {
    margin: 6px auto;
    width: 190px;
    border: 2px solid #ddd;
}

.carbon-mask .line {
    margin: 20px auto;
    width: 190px;
    border: 1px solid #aab3b2;
}

.carbon-mask::before {
    content: "";
    display: block;
    width: 50px;
    height: 80px;
    position: absolute;
    border: 2px solid #eee;
    border-right: 2px dotted #eee;
    left: -50px;
    border-radius: 40px 0px 0px 40px;
}

.carbon-mask::after {
    content: "";
    display: block;
    width: 50px;
    height: 80px;
    position: absolute;
    border: 2px solid #eee;
    border-left: 2px dotted #eee;
    top: 0;
    right: -50px;
    border-radius: 0px 40px 40px 0px;
}

/* n95 */
.n95-mask {
    position: relative;
    width: 150px;
    height: 150px;
    background-image: radial-gradient(#eee, rgb(177, 177, 177));
    background-size: cover;
    border: 3px solid #ccc;
    border-radius: 75px 40px 75px 75px;
    transform: rotate(-45deg);
    transition: 0.7s;
}

.n95-mask:hover {
    transform: translate(0, -10px) rotate(-45deg);
    box-shadow: 0px 20px 10px rgba(0, 0, 0, 0.4);
}

.n95-mask .iron-line-left {
    position: absolute;
    top: 8%;
    left: 22%;
    margin: 6px auto;
    width: 90px;
    border: 2px solid #ddd;
    transform: rotate(5deg);
}

.n95-mask .iron-line-right {
    position: absolute;
    top: 42%;
    left: 54%;
    margin: 6px auto;
    width: 90px;
    border: 2px solid #ddd;
    transform: rotate(85deg);
}

.n95-mask .filter {
    position: absolute;
    top: 6px;
    left: 16px;
    margin: 20px auto;
    width: 30px;
    height: 30px;
    background-image: radial-gradient(#ddd 60%, rgb(177, 177, 177) 40%);
    background-size: contain;
    border: 2px dotted #ddd;
    border-radius: 50%;
}

.n95-mask .mark {
    position: absolute;
    top: 88px;
    left: 2%;
    width: 90px;
    height: 20px;
    background-color: #ddd;
    border: 1px dotted #aab3b2;
    transform: rotate(45deg);
    font-size: 10px;
    color: #666;
    letter-spacing: 0;
    font-weight: 600;
}

.n95-mask::before {
    content: "";
    display: block;
    width: 50px;
    height: 80px;
    position: absolute;
    border: 2px solid #eee;
    border-right: 2px dotted #eee;
    top: -32px;
    left: -16px;
    border-radius: 40px 0px 0px 40px;
    transform: rotate(45deg);
}

.n95-mask::after {
    content: "";
    display: block;
    width: 50px;
    height: 80px;
    position: absolute;
    border: 2px solid #eee;
    border-left: 2px dotted #eee;
    top: 87px;
    right: -17px;
    border-radius: 0px 40px 40px 0px;
    transform: rotate(45deg);
}

/* no-mask */
.no-mask {
    position: relative;
    width: 200px;
    height: 90px;
    background-color: transparent;
    border: 1px dotted #eee;
    border-radius: 2px;
    transition: all 0.7s;
}

.no-mask:hover {
    transform: translate(0, -5px);
}

.no-mask .line {
    margin: 30px auto;
    width: 190px;
    color: #444;
    text-decoration: line-through;
}

.no-mask::before {
    content: "";
    display: block;
    width: 50px;
    height: 80px;
    position: absolute;
    border: 1px dotted #eee;
    border-right: 1px dotted #eee;
    top: 2px;
    left: -50px;
    border-radius: 40px 0px 0px 40px;
}

.no-mask::after {
    content: "";
    display: block;
    width: 50px;
    height: 80px;
    position: absolute;
    border: 1px dotted #eee;
    border-left: 1px dotted #eee;
    top: 2px;
    right: -50px;
    border-radius: 0px 40px 40px 0px;
}

@media (max-width: 768px) {
    .container {
        width: 90%;
    }

    .info {
        width: 90%;
    }

    .info li {
        margin: 10px auto;
        line-height: 1.5;
    }

    .prod-wrapper {
        flex-direction: column;
        margin: 0 auto;
    }

    .prod-name {
        width: 100%;
        margin: 20px auto;
        margin-bottom: 0;
        padding: 0;
    }

    .mask-wrapper {
        width: 100%;
        margin-bottom: 30px;
        padding: 0;
    }

    .desc {
        width: 60%;
        margin: 0 auto;
        margin-bottom: 30px;
    }
}