.problem-list{
    width: calc(98% - 15rem);
    height: calc(100vh - 2rem);
    background-color: #fafafa;
    border-radius: 1rem;
    box-shadow: 0 0 1rem rgba(0,0,0,0.3);
    margin-top: 1rem;
    margin-left: auto; margin-right: auto;
    display: flex;
    flex-direction: column;
    overflow-y: scroll;
}
.problem-item,.problem-header{
    margin: 0.5rem;
    margin-bottom: 0;
    padding: 0.5rem;
    width: calc( 100% - 2rem);
    display: flex;
    color: black;
    flex-direction: row;
    align-items: center;
    border-radius: 0.5rem;
}
.problem-item{
    background-color: white;
}
.problem-header{
    margin-left: 0; margin-right: 0;
    border-radius: 0;
    padding-left: 1rem; padding-right: 1rem;
    margin-top: auto;
    position: sticky;
    background-color: white;
    box-shadow: 0 0rem 0.2rem rgba(0,0,0,0.3);
    bottom: 0;
}
.problem-link,.problem-link-header{
    width: calc(100% - 2rem);
    display: flex;
    flex-direction: row;
    vertical-align: middle;
}
.problem-source-link,.problem-source-link-header{
    width: 2rem;
    height: 100%;
    line-height: 2rem;
    text-align: right;
}
.problem-source-link>img{
    width: 1.5rem;
    height: 1.5rem;
    vertical-align: middle;
}
.problem-link:link, .problem-source-link:link, .problem-link:visited, .problem-source-link:visited{
    color: black;
    text-decoration: none;
}
.problem-link:hover, .problem-source-link:hover, .problem-link:active, .problem-source-link:active{
    text-decoration: underline;
}
.problem-item:hover{
    box-shadow: 0 0 0.5rem rgba(0,0,0,0.3);
}
.problem-id,.problem-id-header{
    width: 3rem;
    font: "Segoe UI", "Microsoft YaHei", sans-serif;
    text-align: center;
    line-height: 2rem;
}
.problem-id{
    font-weight: bold;
}
.problem-title{
    width: calc(100% - 25rem);
    line-height: 2rem;
}
.problem-date-begin,.problem-date-end{
    font-size: 0.8rem;
    margin-left: auto;

}
.problem-date-header{
    font-size: 1rem;
    line-height: 2rem;
}
.problem-status{
    margin-left: auto;
    line-height: 2rem;
}
.search-bar{
    width: 13rem;
    height: 20rem;
    background-color: #fafafa;
    border-radius: 1rem;
    margin-top: 1rem;
    box-shadow: 0 0 1rem rgba(0,0,0,0.3);
    margin-left: 0; margin-right: auto;
    display: flex;
    flex-direction: column;
}
.search-bar>*{
    margin: 0.7rem 1rem 0 1rem;
}
#search-bar-title{
    width: calc(100% - 2rem); text-align: center;
    font-size: 1.5rem;
    font-weight: bold;
}
#search-bar-hr{
    width: calc(100% - 2rem);
}
.search-bar-text{
    font-weight: bold;
    line-height: 2rem;
}
#date-group{
    margin-left: 0.6rem; margin-right: 0.6rem;
    width: calc(100% - 1.2rem);
    height: 1.5rem;
    background-color: white;
    text-align: center;
    border-radius: 0.5rem;
    box-shadow: 0;
    outline: none;
    border: 1px solid #ccc;
}
#search-btn{
    margin-top: auto;
    margin-bottom: 1rem;
    height: 2rem;
    font-size: 1.2rem;
    letter-spacing: auto;
    line-height: 1.2rem;
    text-align: center;
    font-weight: bold;
    width: calc(100% - 2rem);
    background-color: #36d;
    color: white;
    border-radius: 0.5rem;
    border: 1px solid #ccc;
}
#search-btn:hover{
    background-color: #24a;
}