body{
    background-color: aqua;
    color: rebeccapurple;
}
.container{
    width: 500px;
    margin: auto;
}
.vartical-center{
    background-color: #c4ecf3;
    margin: 0;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 500px;
    border-radius: 20px;
    box-shadow: 10px 10px 7px 7px cornflowerblue;
    padding: 20px;
}
.lessons{
    list-style-type: disclosure-closed;
    line-height: 30px;
}
.lessons a{
    text-decoration: none;
    font-weight: bold;
}

.go-back, .reload{
    padding: 11px;
    border-radius: 13px;
    border: none;
    cursor: pointer;
    background: #93e0e4;
    font-weight: bolder;
    color: #3d36a9;
    box-shadow: 10px 9px 1px #3d36a9;
}
.go-back:hover, .reload:hover{
    background: white;
    transition: 0.5s;
}
.reload{
    margin-left: 20px;
}