.item-container {
    width: 25%;
    float: left;
    font-family: 'kai_jian_ti',sans-serif;
}
#mark-search {
    display: flex;
    justify-content: center;
    position: absolute;
    top: 30px;
    right: 30px;
}
#mark-search input {
    width: 150px;
    height: 30px;
    padding: 0 10px;
}
#mark-search input:focus {
    background-color: white;
}
#mark-search button {
    border: none;
    width: 30px;
    height: 30px;
    margin-left: 10px;
}
#mark-select {
    text-align: center;
    margin-bottom: 10px;
}
#mark-select button {
    display: inline-block;
    line-height: 25px;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    margin: 0 5px;
    position: relative;
}
.mark-items {
    width: 220px;
    height: 130px;
    margin: 10px auto;
    padding: 10px;
    border-radius: 20px 0;
    text-align: center;
    overflow: hidden;
    position: relative;
    opacity: 0;
}
.mark-items .close {
    position:absolute;
    top: 5px;
    right: 10px;
    font-weight: 600;
    cursor: pointer;
    display: none;
}
.mark-items:hover .close {
    display: inline;
}
.mark-items .title {
    font-size: 1.5em;
    font-weight: 500;
    margin-top: 15px;
}
.mark-items .category {
    font-size: 0.8em;
    margin: 20px;
}
.mark-items .create-time {
    font-size: 0.8em;
    position: absolute;
    bottom: 15px;
    right: 15px;
}

#add {
    display: block;
    height: 70px;
    width: 70px;
    position: fixed;
    margin:  0 auto;
    left: 0;
    right: 0;
    bottom: 20px;
    text-align: center;
    line-height: 70px;
    text-decoration: none;
    font-size: 3rem;
    border: solid 1px #a1a1a1;
    border-radius: 5px;
    transition: all 0.5s;
}