.usecase h4{
    float: left;
    padding-left: 30px;
    font-size: 20px;
    margin-top: 0;
}
.usecase table tr td {
    width: 40%;
    text-align: justify;
}
.usecase table tr td .title {
    text-align: center;
}

.usecase .content {
    text-align: justify;
}
.usecase .kadai{
    background-color: #0b0b0b;
    color: #fff;
}

.usecase .results_introducing{
    background-color: #3d68e9;
    color: #fff;
}

.usecase .results_introducing_content{
    background-color: #dde1fc;
}

.usecase .Challenges{
    background-color: #d6d4d4;
}
.mb-50{
    float: left;
}