.leftSide{
    display: grid;
    grid-template-columns: auto;
    gap: 20px;
    width: 250px;
    margin-top: 200px;

}
/* .leftSide button{
    outline: none;
    border: none;
    height: 40px;
    font-size: 18px;
    cursor: pointer;
    border-radius: 5px;
    transition: 0.3s;
    
    
} */
.content{
    position: absolute;
    float: left;
    top: 100px;
    left: 360px;
    height: 400px;
    width: 1200px;
    /* border: 1px solid red; */
}
h1{
    font-size: 30px;
}
/* .leftSide button:hover {
    background-color: #ddd;
} */
.leftSide button.active {
    background: #2098D1;
}
.mid{
    float: left;
}
.grammarLeft{
    /* border: 1px solid red; */
    height: 600px;
    width: 480px;
    margin-left: 640px;
    margin-top: 20px;
}
.grammarLeft h1{
    font-size: 20px;
    margin-left: 0px;
}
.imgItem{
    border: 2px solid black;
    border-radius: 10px;
    opacity: 1;
    display: block;
    height: auto;
    transition: .5s ease;
    backface-visibility: hidden;
}

.item{
    display: flex;
}

/* .middle {
    transition: .5s ease;
    opacity: 0;
    position: absolute;
    top: 50%;
    left: 60%;
    transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    text-align: center;
  }
  .item:hover .imgItem {
    opacity: 0.5;
    cursor: pointer;
  }
  
  .item:hover .middle {
    opacity: 1;
    cursor: pointer;
  } */
.item .introduce{
    margin-left: 20px;
    margin-top: -20px;
    
}
.introduce p{
    width: 300px;
    margin-top: -10px;
}
.introduce a{
    margin-left: -20px;
}
 .linkCourse {
    color: white;
    font-size: 16px;
    padding: 16px 32px;
    font-weight: 600;
  }
.items{
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.document h1{
    float: left;
}
.getDoc{
    margin-top: 18px;
    outline: none;
    border: none;
    cursor: pointer;
    margin-left: 20px;
    height: 40px;
    padding: 10px;
    font-size: 18px;
    background-color: rgb(200, 245, 230);
    border-radius: 5px;
    font-weight: 600;
    color: blue;
}
.allDoc{
    /* margin-left: -40px; */
    border: 1px solid black;
    padding-left: 10px;
    background-color: aliceblue;
    width: 600px;
    margin-top: 25px;
    line-height: 1;
    text-align: left;
    border-radius: 5px;
    box-shadow: 5px 10px #888888;
}
.allDoc a{
    text-decoration: underline;
    color: blue;
}
#hand{
    color: rgb(255, 0, 0);
    font-size: 30px;
    margin-left: 10px;
    margin-top: 30px;
}
.leftSide button {
    display: inline-block;
    vertical-align: middle;
    -webkit-transform: perspective(1px) translateZ(0);
    transform: perspective(1px) translateZ(0);
    box-shadow: 0 0 1px rgba(0, 0, 0, 0);
    position: relative;
    -webkit-transition-property: color;
    transition-property: color;
    -webkit-transition-duration: 0.3s;
    transition-duration: 0.2s;
    outline: none;
    border: none;
    height: 40px;
    font-size: 18px;
    cursor: pointer;
    border-radius: 5px;
  }
  .leftSide button:before {
    content: "";
    position: absolute;
    z-index: -1;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #2098D1;
    -webkit-transform: scaleX(0);
    transform: scaleX(0);
    -webkit-transform-origin: 0 50%;
    transform-origin: 0 50%;
    -webkit-transition-property: transform;
    transition-property: transform;
    -webkit-transition-duration: 0.3s;
    transition-duration: 0.3s;
    -webkit-transition-timing-function: ease-out;
    transition-timing-function: ease-out;
  }
  .leftSide button:hover, .leftSide button:focus, .leftSide button:active {
    color: white;
  }
  .leftSide button:hover:before, .leftSide button:focus:before, .leftSide button:active:before {
    -webkit-transform: scaleX(1);
    transform: scaleX(1);
  }
#iconMenu{
    font-size: 20px;
}