.panel-accordion input {
    display: none;
}

.panel-accordion label input+span {
    border-radius: 4px;
    display: block;
    text-align: center;
    border: 1px solid #626469;
    padding: 5px 15px;
    cursor: pointer;
    font-weight: normal;
    color: #626469;
}

.panel-accordion input:checked+span {
    border-color: transparent;
    background-color: #001d51;
    color: white;
}