Practice/_src/admin/scss/common/_layout.scss

html,
body {
  min-height:100%;
}

body,
html,
input,
select,
button,
textarea {
  font-family: Roboto, "Spoqa Han Sans", "Spoqa Han Sans JP", Sans-serif;
}


.application {
  position:absolute;
  top:0;
  left:0;
  right:0;
  bottom:0;
  -webkit-display:flex;
  display:flex;
  flex-direction: column;
}

.background-container {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: -1;
  background-color: #3f4245;

  .bg-1 {
    background-image: url(../images/admin/bg-dark.png);
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    width: 100%;
    height: 100%;
    position: absolute;
    z-index: 2;
  }

  .bg-2 {
    position: absolute;
    width: 100%;
    height: 100%;
    background: url(../images/admin/bg-noise.png);
    z-index: 2;
  }
}

#nav-bar {
  flex-grow: 0;
  flex-shrink: 0;
  z-index: 1000;
  background-color: rgba(0,0,0,.7);
  height:60px;
  width:100%;

  .logo {
    display:flex;
    height:60px;
    //background:rgba(0,0,0,.7);
    color:#fff;
    font-weight:900;
    font-size:20px;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    width:200px;
  }


  .btn-menu-toggle {
    display:none;
    @media screen and (max-width:768px) {
      display:block;
      position:fixed;
      right:15px;
      top:15px;
      font-size:24px;
      background:transparent;
      border:0;
      color:#fff;
    }
  }

  .btn-logout {
    position:fixed;
    right:15px;
    top:15px;
    font-size:24px;
    background:transparent;
    border:0;
    color:#fff;

    @media screen and (max-width:768px) {
      display:none;
    }
  }
}

#content {
  position: relative;
  flex-grow: 1;
  overflow: hidden;
  -webkit-overflow-scrolling: touch;
  display:flex;


  #left-panel {
    width:200px;
    overflow:hidden;
    background-color: rgba(0,0,0,.15);

    @media screen and (max-width:768px) {
      width:0px;

      &.opened {
        width:100%;
        position: absolute;
        z-index: 100;
        background: #000;
      }
    }

    #main-navigation {
      list-style:none;
      padding:0;
      margin:0;

      > li {
        display:block;
        position:relative;
        -webkit-transition: all .2s ease;
        -moz-transition: all .2s ease;
        -ms-transition: all .2s ease;
        -o-transition: all .2s ease;
        transition: all .2s ease;

        &:first-child {
          border-top: 0;
        }

        > a {
          display:block;
          padding:20px 10px;
          color:#c8c8c8;
          border-left:2px solid #293242;
          font-size:14px;
          text-decoration: none;
          -webkit-transition: all .2s ease;
          -moz-transition: all .2s ease;
          -ms-transition: all .2s ease;
          -o-transition: all .2s ease;
          transition: all .2s ease;

          > i {
            margin-right:5px;
          }

          &:after {
            content:"\f105";
            font-family:'Font Awesome 5 Pro';
            position:absolute; right:20px; top:20px;
            -webkit-transition: all .2s ease;
            -moz-transition: all .2s ease;
            -ms-transition: all .2s ease;
            -o-transition: all .2s ease;
            transition: all .2s ease;
          }
        }

        > ul {
          height:0;
          visibility: hidden;
          opacity:0;
          margin:0;
          padding:0;
          list-style:none;
          -webkit-transition: all .2s ease;
          -moz-transition: all .2s ease;
          -ms-transition: all .2s ease;
          -o-transition: all .2s ease;
          transition: all .2s ease;

          > li {
            display:block;
            //border-top:1px solid rgba(#ccc,0.4);

            > a {
              padding:15px 25px;
              display:block;
              color:#c8c8c8;
              text-decoration:none;

              background: rgba(0,0,0,0.4);
            }

            &:hover > a {
              color:#fff;
            }

            &.active {
              > a {
                background:#fff;
                color:#282828;
              }
            }

          }
        }


        &.open {

          > a:after {
            -webkit-transform: rotate(90deg);
            -moz-transform:rotate(90deg);
            transform:rotate(90deg);
          }

          > ul {
            height:auto;
            visibility: visible;
            opacity:1;
          }
        }

        &:active > a,
        &:hover > a {
          border-color:#96ddfe;
          color:#f1f3f6;
        }

      }
    }
  }

  #main {
    -webkit-flex:1;
    flex:1;
    -webkit-box-flex: 1;
    -webkit-flex-grow: 1;
    flex-grow: 1;
    position:relative;
    color:#fff;

    .main {
      padding:15px;
      height:100%;
      overflow-x:hidden;
      overflow-y:scroll;
    }
  }
}

#header {
  background:#3498db;
  >:first-child {
    background:#3498db;
  }
}

.frame-content {
  background-color:#3f4245;
  min-height:100%;
  color:#fff;
  padding:15px;
}

.page-header {
  -webkit-display:flex;
  display:flex;
  background-color: rgba(0,0,0,.15);
  border:0px;
  color: hsla(0,0%,100%,.7);
  margin:-15px -15px 15px;
  padding:0px 15px;
  height:60px;
  justify-content: left;
  align-items: center;
  z-index:10;

  @media screen and (max-width:768px) {
    left:0px;
  }

  .page-title {
    margin:0px;
    font-size:18px;
  }
}