* {
    box-sizing: border-box;
}

label[for] {
    cursor: pointer;
}

input[type="checkbox"] {
    display: none;
}

body {
    background-color: #222222;
}

.grid {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    -webkit-box-align: start;
    -webkit-align-items: flex-start;
    -ms-flex-align: start;
    align-items: flex-start;
    -webkit-align-content: flex-start;
    -ms-flex-line-pack: start;
    align-content: flex-start;
    z-index: 0;
    padding: 16px;
    overflow: auto;
    background-color: #222;
    text-align: center;
    -webkit-transition: opacity .75s;
    transition: opacity .75s;
}
.grid .grid-item {
    display: inline-block;
    padding: 16px;
    opacity: .75;
    -webkit-transition: opacity .5s;
    transition: opacity .5s;
    flex-shrink: 0;
}
.grid .grid-item:hover {
    opacity: 1;
}
.grid img {
    width: 316px;
    height: 316px;
    max-width: 100%;
    max-height: 100%;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
    transition: opacity 1s ease-in-out;
}

.head {
    display: flex;
    justify-content: space-around;
    margin: 20px 0;
}
.head img {
    width: 15%;
}

@media screen and (max-width: 1024px) {
    .grid .grid-item {
        width: 50%;
    }
    .head img {
        width: 30%;
    }
}
@media screen and (max-width: 480px) {
    .grid .grid-item {
        width: 100%;
    }
    .head img {
        width: 100%;
    }
}